Adding upstream version 1:115.7.0.upstream/1%115.7.0 upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-07 17:32:43 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-07 17:32:43 +0000
commit: 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
tree: a68f146d7fa01f0134297619fbe7e33db084e0aa /comm/mailnews/base/public
parent: Initial commit. (diff)
download: thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz
thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip
66 files changed, 6971 insertions, 0 deletions
diff --git a/comm/mailnews/base/public/MailNewsTypes.h b/comm/mailnews/base/public/MailNewsTypes.h
new file mode 100644
index 0000000000..e6f58cb56b
--- /dev/null
+++ b/comm/mailnews/base/public/MailNewsTypes.h
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MailNewsTypes_h__
+#define MailNewsTypes_h__
+
+#include "msgCore.h"
+#include "MailNewsTypes2.h"
+
+/* nsMsgKey is a unique ID for a particular message in a folder.  If you want
+   a handle to a message that will remain valid even after resorting the folder
+   or otherwise changing their indices, you want one of these rather than a
+   nsMsgViewIndex. nsMsgKeys don't survive local mail folder compression,
+   however.
+ */
+const nsMsgKey nsMsgKey_None = 0xffffffff;
+
+/* nsMsgViewIndex
+ *
+ * A generic index type from which other index types are derived.  All
+ * nsMsgViewIndex derived types are zero based.
+ *
+ * The following index types are currently supported:
+ *  - nsMsgViewIndex - an index into the list of messages or folders or groups,
+ *    where zero is the first one to show, one is the second, etc...
+ *  - AB_SelectionIndex
+ *  - AB_NameCompletionIndex
+ */
+
+const nsMsgViewIndex nsMsgViewIndex_None = 0xFFFFFFFF;
+
+/* kSizeUnknown is a special value of folder size that indicates the size
+ * is unknown yet. Usually this causes the folder to determine the real size
+ * immediately as it is queried by a consumer.
+ */
+const int64_t kSizeUnknown = -1;
+
+#endif
diff --git a/comm/mailnews/base/public/MailNewsTypes2.idl b/comm/mailnews/base/public/MailNewsTypes2.idl
new file mode 100644
index 0000000000..aeb8df2ec6
--- /dev/null
+++ b/comm/mailnews/base/public/MailNewsTypes2.idl
@@ -0,0 +1,93 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+typedef unsigned long nsMsgKey;
+typedef unsigned long nsMsgViewIndex;
+
+typedef long nsMsgSearchScopeValue;
+
+typedef long nsMsgPriorityValue;
+typedef long nsMsgSocketTypeValue;
+typedef long nsMsgAuthMethodValue;
+
+typedef unsigned long nsMsgJunkStatus;
+
+typedef unsigned long nsMsgJunkScore;
+
+[scriptable, uuid(94C0D8D8-2045-11d3-8A8F-0060B0FC04D2)]
+interface nsMsgPriority : nsISupports {
+    const nsMsgPriorityValue notSet = 0;
+    const nsMsgPriorityValue none = 1;
+    const nsMsgPriorityValue lowest = 2;
+    const nsMsgPriorityValue low = 3;
+    const nsMsgPriorityValue normal = 4;
+    const nsMsgPriorityValue high = 5;
+    const nsMsgPriorityValue highest = 6;
+    //the default priority (if none) is set in the message
+    const nsMsgPriorityValue Default = 4;
+};
+
+/**
+ * Defines whether to use SSL or STARTTLS or not.
+ * Used by @see nsIMsgIncomingServer.socketType
+ * and @see nsISmtpServer.socketType
+ */
+[scriptable, uuid(bc78bc74-1b34-48e8-ac2b-968e8dff1aeb)]
+interface nsMsgSocketType : nsISupports {
+    /// No SSL or STARTTLS
+    const nsMsgSocketTypeValue plain = 0;
+    /// Use TLS via STARTTLS, but only if server offers it.
+    /// @deprecated This is vulnerable to MITM attacks
+    const nsMsgSocketTypeValue trySTARTTLS = 1;
+    /// Insist on TLS via STARTTLS.
+    /// Uses normal port.
+    const nsMsgSocketTypeValue alwaysSTARTTLS = 2;
+    /// Connect via SSL.
+    /// Needs special SSL port.
+    const nsMsgSocketTypeValue SSL = 3;
+};
+
+/**
+ * Defines which authentication schemes we should try.
+ * Used by @see nsIMsgIncomingServer.authMethod
+ * and @see nsISmtpServer.authMethod
+ */
+[scriptable, uuid(4a10e647-d179-4a53-b7ef-df575ff5f405)]
+interface nsMsgAuthMethod : nsISupports {
+    // 0 is intentionally undefined and invalid
+    /// No login needed. E.g. IP-address-based.
+    const nsMsgAuthMethodValue none = 1;
+    /// Do not use AUTH commands (e.g. AUTH=PLAIN),
+    /// but the original login commands that the protocol specified
+    /// (POP: "USER"/"PASS", IMAP: "login", not valid for SMTP)
+    const nsMsgAuthMethodValue old = 2;
+    /// password in the clear. AUTH=PLAIN/LOGIN or old-style login.
+    const nsMsgAuthMethodValue passwordCleartext = 3;
+    /// hashed password. CRAM-MD5, DIGEST-MD5
+    const nsMsgAuthMethodValue passwordEncrypted = 4;
+    /// Kerberos / GSSAPI (Unix single-signon)
+    const nsMsgAuthMethodValue GSSAPI = 5;
+    /// NTLM is a Windows single-singon scheme.
+    /// Includes MSN / Passport.net, which is the same with a different name.
+    const nsMsgAuthMethodValue NTLM = 6;
+    /// Auth External is cert-based authentication
+    const nsMsgAuthMethodValue External = 7;
+    /// Encrypted password or Kerberos / GSSAPI or NTLM.
+    /// @deprecated - for migration only.
+    const nsMsgAuthMethodValue secure = 8;
+    /// Let us pick any of the auth types supported by the server.
+    /// Discouraged, because vulnerable to MITM attacks, even if server offers secure auth.
+    const nsMsgAuthMethodValue anything = 9;
+
+    /// Use OAuth2 to authenticate.
+    const nsMsgAuthMethodValue OAuth2 = 10;
+};
+
+typedef long nsMsgViewSortOrderValue;
+typedef long nsMsgViewSortTypeValue;
+typedef long nsMsgViewTypeValue;
+typedef long nsMsgViewFlagsTypeValue;
diff --git a/comm/mailnews/base/public/moz.build b/comm/mailnews/base/public/moz.build
new file mode 100644
index 0000000000..be6deb7da9
--- /dev/null
+++ b/comm/mailnews/base/public/moz.build
@@ -0,0 +1,80 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+XPIDL_SOURCES += [
+    "MailNewsTypes2.idl",
+    "mozINewMailListener.idl",
+    "mozINewMailNotificationService.idl",
+    "msgIOAuth2Module.idl",
+    "nsICopyMessageListener.idl",
+    "nsICopyMessageStreamListener.idl",
+    "nsIFolderListener.idl",
+    "nsIFolderLookupService.idl",
+    "nsIIncomingServerListener.idl",
+    "nsIMailAuthModule.idl",
+    "nsIMailChannel.idl",
+    "nsIMapiRegistry.idl",
+    "nsIMessenger.idl",
+    "nsIMessengerMigrator.idl",
+    "nsIMessengerOSIntegration.idl",
+    "nsIMessengerWindowService.idl",
+    "nsIMsgAccount.idl",
+    "nsIMsgAccountManager.idl",
+    "nsIMsgAsyncPrompter.idl",
+    "nsIMsgBiffManager.idl",
+    "nsIMsgContentPolicy.idl",
+    "nsIMsgCopyService.idl",
+    "nsIMsgCopyServiceListener.idl",
+    "nsIMsgCustomColumnHandler.idl",
+    "nsIMsgDBView.idl",
+    "nsIMsgEnumerator.idl",
+    "nsIMsgFolder.idl",
+    "nsIMsgFolderCache.idl",
+    "nsIMsgFolderCacheElement.idl",
+    "nsIMsgFolderCompactor.idl",
+    "nsIMsgFolderListener.idl",
+    "nsIMsgFolderNotificationService.idl",
+    "nsIMsgHdr.idl",
+    "nsIMsgIdentity.idl",
+    "nsIMsgIncomingServer.idl",
+    "nsIMsgMailNewsUrl.idl",
+    "nsIMsgMailSession.idl",
+    "nsIMsgMdnGenerator.idl",
+    "nsIMsgMessageService.idl",
+    "nsIMsgOfflineManager.idl",
+    "nsIMsgPluggableStore.idl",
+    "nsIMsgProgress.idl",
+    "nsIMsgProtocolHandler.idl",
+    "nsIMsgProtocolInfo.idl",
+    "nsIMsgPurgeService.idl",
+    "nsIMsgShutdown.idl",
+    "nsIMsgStatusFeedback.idl",
+    "nsIMsgTagService.idl",
+    "nsIMsgThread.idl",
+    "nsIMsgUserFeedbackListener.idl",
+    "nsIMsgWindow.idl",
+    "nsISpamSettings.idl",
+    "nsIStatusBarBiffManager.idl",
+    "nsIStopwatch.idl",
+    "nsISubscribableServer.idl",
+    "nsIUrlListener.idl",
+    "nsIUserInfo.idl",
+    "nsMsgFolderFlags.idl",
+    "nsMsgMessageFlags.idl",
+]
+
+if CONFIG["OS_ARCH"] == "WINNT":
+    XPIDL_SOURCES += [
+        "nsIMessengerWindowsIntegration.idl",
+    ]
+
+XPIDL_MODULE = "msgbase"
+
+EXPORTS += [
+    "MailNewsTypes.h",
+    "msgCore.h",
+    "nsMsgHeaderMasks.h",
+    "nsMsgLocalFolderHdrs.h",
+]
diff --git a/comm/mailnews/base/public/mozINewMailListener.idl b/comm/mailnews/base/public/mozINewMailListener.idl
new file mode 100644
index 0000000000..467acb671c
--- /dev/null
+++ b/comm/mailnews/base/public/mozINewMailListener.idl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(e15f104f-a16d-4e51-a362-4b4c5efe05b9)]
+/**
+ * Callback interface for objects interested in receiving new mail notifications
+ * from mozINewMailNotificationService
+ * NOTE: THIS INTERFACE IS UNDER ACTIVE DEVELOPMENT AND SUBJECT TO CHANGE,
+ * see https://bugzilla.mozilla.org/show_bug.cgi?id=715799
+ */
+interface mozINewMailListener : nsISupports {
+  /** The new mail notification service will call this when the number of interesting
+   * messages has changed
+   *
+   * @param unreadCount   The number of unread messages the user cares to be notified about
+   */
+  void onCountChanged(in unsigned long count);
+};
diff --git a/comm/mailnews/base/public/mozINewMailNotificationService.idl b/comm/mailnews/base/public/mozINewMailNotificationService.idl
new file mode 100644
index 0000000000..cdd049bcca
--- /dev/null
+++ b/comm/mailnews/base/public/mozINewMailNotificationService.idl
@@ -0,0 +1,58 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface mozINewMailListener;
+
+typedef long newMailListenerFlag;
+
+[scriptable, uuid(7fef9018-c9f1-4cbd-b57c-d6555cf3a668)]
+/** New mail notification service. This service watches all the relevant
+ * folder and message change events, preferences etc. and keeps track of
+ * the specific messages the user wants notifications for.
+ * NOTE: THIS INTERFACE IS UNDER ACTIVE DEVELOPMENT AND SUBJECT TO CHANGE,
+ * see https://bugzilla.mozilla.org/show_bug.cgi?id=715799
+ * Registered mozINewMailListeners are called when the message count or
+ * specific list of notified messages changes.
+ * ** Should also document the observer service callback that allows
+ *    plugins to override notifications by folder
+ */
+interface mozINewMailNotificationService : nsISupports {
+  /**
+   * @name Notification flags
+   * These flags determine which notifications will be sent.
+   * @{
+   */
+  /// mozINewMailListener::count notification
+  const newMailListenerFlag count = 0x1;
+
+  /// mozINewMailListener::messages notification
+  const newMailListenerFlag messages = 0x2;
+
+  /** @} */
+
+  /**
+   * addListener - Register a mozINewMailListener to receive callbacks
+   *               when the count or list of notification-worthy messages
+   *               changes.
+   * @param aListener   mozINewMailListener to call back
+   * @param flags       Bitmask of newMailListenerFlag values indicating
+   *                    the particular callbacks this listener wants.
+   *                    If the listener is already registered with the
+   *                    notification service, the existing set of flags is
+   *                    replaced by the values passed in this parameter.
+   */
+  void addListener(in mozINewMailListener aListener,
+                   in newMailListenerFlag flags);
+  /**
+   * removeListener - remove a listener from the service
+   * @param aListener  The listener to remove
+   */
+  void removeListener(in mozINewMailListener aListener);
+
+  /// The current count of notification-worth unread messages
+  readonly attribute long messageCount;
+};
diff --git a/comm/mailnews/base/public/msgCore.h b/comm/mailnews/base/public/msgCore.h
new file mode 100644
index 0000000000..679e510887
--- /dev/null
+++ b/comm/mailnews/base/public/msgCore.h
@@ -0,0 +1,210 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Include files we are going to want available to all files....these files
+   include NSPR, memory, and string header files among others */
+
+#ifndef msgCore_h__
+#define msgCore_h__
+
+#include "nscore.h"
+#include "nspr.h"
+#include "plstr.h"
+#include "nsCRTGlue.h"
+
+class nsIMsgDBHdr;
+class nsIMsgFolder;
+
+// include common interfaces such as the service manager and the repository....
+#include "nsIServiceManager.h"
+#include "nsIComponentManager.h"
+
+/*
+ * The suffix we use for the mail summary file.
+ */
+#define SUMMARY_SUFFIX u".msf"
+#define SUMMARY_SUFFIX8 ".msf"
+#define SUMMARY_SUFFIX_LENGTH 4
+
+/*
+ * The suffix we use for folder subdirectories.
+ */
+#define FOLDER_SUFFIX u".sbd"
+#define FOLDER_SUFFIX8 ".sbd"
+#define FOLDER_SUFFIX_LENGTH 4
+
+/*
+ * These are folder property strings, which are used in several places.
+
+ */
+// Most recently used (opened, moved to, got new messages)
+#define MRU_TIME_PROPERTY "MRUTime"
+// Most recently moved to, for recent folders list in move menu
+#define MRM_TIME_PROPERTY "MRMTime"
+
+/* NS_ERROR_MODULE_MAILNEWS is defined in mozilla/xpcom/public/nsError.h */
+
+/*
+ * NS_ERROR macros - use these macros to generate error constants
+ * to be used by XPCOM interfaces and possibly other useful things
+ * do not use these macros in your code - declare error macros for
+ * each specific error you need.
+ *
+ * for example:
+ * #define NS_MSG_ERROR_NO_SUCH_FOLDER NS_MSG_GENERATE_FAILURE(4)
+ *
+ */
+
+/* use these routines to generate error values */
+#define NS_MSG_GENERATE_RESULT(severity, value) \
+  NS_ERROR_GENERATE(severity, NS_ERROR_MODULE_MAILNEWS, value)
+
+#define NS_MSG_GENERATE_SUCCESS(value) \
+  NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_MAILNEWS, value)
+
+#define NS_MSG_GENERATE_FAILURE(value) \
+  NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_MAILNEWS, value)
+
+/* these are shortcuts to generate simple errors with a zero value */
+#define NS_MSG_SUCCESS NS_MSG_GENERATE_SUCCESS(0)
+#define NS_MSG_FAILURE NS_MSG_GENERATE_FAILURE(0)
+
+#define IS_SPACE(VAL) \
+  (((((PRIntn)(VAL)) & 0x7f) == ((PRIntn)(VAL))) && isspace((PRIntn)(VAL)))
+
+#define IS_DIGIT(i) ((((unsigned int)(i)) > 0x7f) ? (int)0 : isdigit(i))
+#if defined(XP_WIN)
+#  define IS_ALPHA(VAL) (isascii((int)(VAL)) && isalpha((int)(VAL)))
+#else
+#  define IS_ALPHA(VAL) \
+    ((((unsigned int)(VAL)) > 0x7f) ? (int)0 : isalpha((int)(VAL)))
+#endif
+
+/* for retrieving information out of messenger nsresults */
+
+#define NS_IS_MSG_ERROR(err) \
+  (NS_ERROR_GET_MODULE(err) == NS_ERROR_MODULE_MAILNEWS)
+
+#define NS_MSG_SUCCEEDED(err) (NS_IS_MSG_ERROR(err) && NS_SUCCEEDED(err))
+
+#define NS_MSG_FAILED(err) (NS_IS_MSG_ERROR(err) && NS_FAILED(err))
+
+#define NS_MSG_PASSWORD_PROMPT_CANCELLED NS_MSG_GENERATE_SUCCESS(1)
+
+/**
+ * Indicates that a search is done/terminated because it was interrupted.
+ * Interrupting a search originally notified listeners with
+ * OnSearchDone(NS_OK), so we define a success value to continue doing this,
+ * and because the search was fine except for an explicit call to interrupt it.
+ */
+#define NS_MSG_SEARCH_INTERRUPTED NS_MSG_GENERATE_SUCCESS(2)
+
+/* This is where we define our errors. There has to be a central
+   place so we don't use the same error codes for different errors.
+*/
+#define NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE NS_MSG_GENERATE_FAILURE(5)
+#define NS_MSG_ERROR_FOLDER_SUMMARY_MISSING NS_MSG_GENERATE_FAILURE(6)
+#define NS_MSG_ERROR_FOLDER_MISSING NS_MSG_GENERATE_FAILURE(7)
+
+#define NS_MSG_MESSAGE_NOT_FOUND NS_MSG_GENERATE_FAILURE(8)
+#define NS_MSG_NOT_A_MAIL_FOLDER NS_MSG_GENERATE_FAILURE(9)
+
+#define NS_MSG_FOLDER_BUSY NS_MSG_GENERATE_FAILURE(10)
+
+#define NS_MSG_COULD_NOT_CREATE_DIRECTORY NS_MSG_GENERATE_FAILURE(11)
+#define NS_MSG_CANT_CREATE_FOLDER NS_MSG_GENERATE_FAILURE(12)
+
+#define NS_MSG_FILTER_PARSE_ERROR NS_MSG_GENERATE_FAILURE(13)
+
+#define NS_MSG_FOLDER_UNREADABLE NS_MSG_GENERATE_FAILURE(14)
+
+#define NS_MSG_ERROR_WRITING_MAIL_FOLDER NS_MSG_GENERATE_FAILURE(15)
+
+#define NS_MSG_ERROR_NO_SEARCH_VALUES NS_MSG_GENERATE_FAILURE(16)
+
+#define NS_MSG_ERROR_INVALID_SEARCH_SCOPE NS_MSG_GENERATE_FAILURE(17)
+
+#define NS_MSG_ERROR_INVALID_SEARCH_TERM NS_MSG_GENERATE_FAILURE(18)
+
+#define NS_MSG_FOLDER_EXISTS NS_MSG_GENERATE_FAILURE(19)
+
+#define NS_MSG_ERROR_OFFLINE NS_MSG_GENERATE_FAILURE(20)
+
+#define NS_MSG_POP_FILTER_TARGET_ERROR NS_MSG_GENERATE_FAILURE(21)
+
+#define NS_MSG_INVALID_OR_MISSING_SERVER NS_MSG_GENERATE_FAILURE(22)
+
+#define NS_MSG_SERVER_USERNAME_MISSING NS_MSG_GENERATE_FAILURE(23)
+
+#define NS_MSG_INVALID_DBVIEW_INDEX NS_MSG_GENERATE_FAILURE(24)
+
+#define NS_MSG_NEWS_ARTICLE_NOT_FOUND NS_MSG_GENERATE_FAILURE(25)
+
+#define NS_MSG_ERROR_COPY_FOLDER_ABORTED NS_MSG_GENERATE_FAILURE(26)
+// this error means a url was queued but never run because one of the urls
+// it was queued after failed. We send an OnStopRunningUrl with this error code
+// so the listeners can know that we didn't run the url.
+#define NS_MSG_ERROR_URL_ABORTED NS_MSG_GENERATE_FAILURE(27)
+
+// when num of custom headers exceeds 50
+#define NS_MSG_CUSTOM_HEADERS_OVERFLOW NS_MSG_GENERATE_FAILURE(28)
+
+// when custom header has invalid characters (as per rfc 2822)
+#define NS_MSG_INVALID_CUSTOM_HEADER NS_MSG_GENERATE_FAILURE(29)
+
+// when local caches are password protect and user isn't auth
+#define NS_MSG_USER_NOT_AUTHENTICATED NS_MSG_GENERATE_FAILURE(30)
+
+#define NS_MSG_ERROR_COPYING_FROM_TMP_DOWNLOAD \
+  NS_MSG_GENERATE_FAILURE(31)  // pop3 downloaded to tmp file, and failed.
+
+// The code tried to stream a message using the aLocalOnly argument, but
+// the message was not cached locally.
+#define NS_MSG_ERROR_MSG_NOT_OFFLINE NS_MSG_GENERATE_FAILURE(32)
+
+// The imap server returned NO or BAD for an IMAP command
+#define NS_MSG_ERROR_IMAP_COMMAND_FAILED NS_MSG_GENERATE_FAILURE(33)
+
+#define NS_MSG_ERROR_INVALID_FOLDER_NAME NS_MSG_GENERATE_FAILURE(34)
+
+/* Error codes for message compose are defined in
+   compose\src\nsMsgComposeStringBundle.h. Message compose use the same error
+   code space as other mailnews modules. To avoid any conflict, values between
+   12500 and 12999 are reserved.
+*/
+#define NS_MSGCOMP_ERROR_BEGIN 12500
+/* NS_ERROR_NNTP_NO_CROSS_POSTING lives here, and not in
+ * nsMsgComposeStringBundle.h, because it is used in news and compose. */
+#define NS_ERROR_NNTP_NO_CROSS_POSTING NS_MSG_GENERATE_FAILURE(12554)
+#define NS_MSGCOMP_ERROR_END 12999
+
+#if defined(XP_WIN)
+#  define MSG_LINEBREAK "\015\012"
+#  define MSG_LINEBREAK_LEN 2
+#else
+#  define MSG_LINEBREAK "\012"
+#  define MSG_LINEBREAK_LEN 1
+#endif
+
+/*
+ * On Windows, we use \r\n as the line terminator in mbox files. On
+ * other platforms, we use \n. However, we need to be able to
+ * recognize line terminators produced on any platform, because we
+ * allow profiles (including the mbox files they contain) to be shared
+ * between platforms.
+ *
+ * Returns 0 (i.e., false) if the line is not blank, or otherwise the
+ * length of the line terminator, i.e., 1 for \n or 2 for \r\n.
+ */
+#define IS_MSG_LINEBREAK(line) \
+  (line[0] == '\012' ? 1 : ((line[0] == '\015' && line[1] == '\012') ? 2 : 0))
+
+#define NS_MSG_BASE
+#define NS_MSG_BASE_STATIC_MEMBER_(type) type
+
+/// The number of microseconds in a day. This comes up a lot.
+#define PR_USEC_PER_DAY (PRTime(PR_USEC_PER_SEC) * 60 * 60 * 24)
+
+#endif  // msgCore_h__
diff --git a/comm/mailnews/base/public/msgIOAuth2Module.idl b/comm/mailnews/base/public/msgIOAuth2Module.idl
new file mode 100644
index 0000000000..e3d1f8aa15
--- /dev/null
+++ b/comm/mailnews/base/public/msgIOAuth2Module.idl
@@ -0,0 +1,56 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgIncomingServer;
+interface nsISmtpServer;
+
+/**
+ * A listener callback for OAuth2 SASL authentication. This would be represented
+ * as a promise, but this needs to be consumed by C++ code.
+ */
+[scriptable, uuid(9a088b49-bc13-4f99-9478-053a6a43e370)]
+interface msgIOAuth2ModuleListener : nsISupports {
+  /**
+   * Called on successful OAuth2 authentication with the base64-encoded
+   * string to send as the client initial response for SASL XOAUTH2.
+   */
+  void onSuccess(in ACString aBearerToken);
+
+  /// Called on failed OAuth2 authentication.
+  void onFailure(in nsresult aError);
+};
+
+/**
+ * An interface for managing the responsibilities of using OAuth2 to produce a
+ * bearer token, for use in SASL steps.
+ */
+[scriptable, uuid(68c275f8-cfa7-4622-b279-af290616cae6)]
+interface msgIOAuth2Module : nsISupports {
+  /**
+   * Initialize the OAuth2 parameters from an SMTP server, and return whether or
+   * not we can authenticate with OAuth2.
+   */
+  bool initFromSmtp(in nsISmtpServer aSmtpServer);
+
+  /**
+   * Initialize the OAuth2 parameters from an incoming server, and return
+   * whether or not we can authenticate with OAuth2.
+   */
+  bool initFromMail(in nsIMsgIncomingServer aServer);
+
+  /**
+   * Connect to the OAuth2 server to get an access token.
+   * @param aWithUI   If false, do not allow a dialog to be popped up to query
+   *                  for a password.
+   * @param aCallback Listener that handles the async response.
+   */
+  void connect(in boolean aWithUI, in msgIOAuth2ModuleListener aCallback);
+};
+
+%{C++
+#define MSGIOAUTH2MODULE_CONTRACTID "@mozilla.org/mail/oauth2-module;1"
+%}
diff --git a/comm/mailnews/base/public/nsICopyMessageListener.idl b/comm/mailnews/base/public/nsICopyMessageListener.idl
new file mode 100644
index 0000000000..4c13dab280
--- /dev/null
+++ b/comm/mailnews/base/public/nsICopyMessageListener.idl
@@ -0,0 +1,24 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+interface nsIMsgDBHdr;
+interface nsIInputStream;
+
+[scriptable, uuid(53CA78FE-E231-11d2-8A4D-0060B0FC04D2)]
+
+/*  Use this for any object that wants to handle copying/moving messages to it */
+
+interface nsICopyMessageListener :  nsISupports
+{
+  void beginCopy();
+  void startMessage();
+  void copyData(in nsIInputStream aIStream, in long aLength);
+  void endMessage(in nsMsgKey key);
+  void endCopy(in boolean copySucceeded);
+  void endMove(in boolean moveSucceeded);
+};
diff --git a/comm/mailnews/base/public/nsICopyMessageStreamListener.idl b/comm/mailnews/base/public/nsICopyMessageStreamListener.idl
new file mode 100644
index 0000000000..772a69080b
--- /dev/null
+++ b/comm/mailnews/base/public/nsICopyMessageStreamListener.idl
@@ -0,0 +1,20 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+interface nsICopyMessageListener;
+interface nsIURI;
+
+[scriptable, uuid(7741DAEC-2125-11d3-8A90-0060B0FC04D2)]
+
+interface nsICopyMessageStreamListener: nsISupports
+{
+  void init(in nsICopyMessageListener destination);
+  void startMessage();
+  void endMessage(in nsMsgKey key);
+  void endCopy(in nsIURI uri, in nsresult status);
+};
diff --git a/comm/mailnews/base/public/nsIFolderListener.idl b/comm/mailnews/base/public/nsIFolderListener.idl
new file mode 100644
index 0000000000..3906ef2f46
--- /dev/null
+++ b/comm/mailnews/base/public/nsIFolderListener.idl
@@ -0,0 +1,70 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgFolder;
+interface nsIMsgDBHdr;
+
+typedef unsigned long folderListenerNotifyFlagValue;
+
+/**
+ * nsIFolderListener defines callbacks to handle various notifications
+ * about changes in folders.
+ * These listeners can be attached to individual folders, or they
+ * can be registered globally, with nsIMsgMailSession.
+ * These notifications originate from nsIMsgFolder implementations.
+ * (nsIMsgFolder has corresponding methods for generating these
+ * notifications).
+ */
+[scriptable, uuid(f60ee1a2-6d81-422c-958f-d408b1b2daa7)]
+interface nsIFolderListener : nsISupports {
+  // "added" flag covers adding both messages and child folders.
+  const folderListenerNotifyFlagValue added = 0x1;
+  void onFolderAdded(in nsIMsgFolder parent, in nsIMsgFolder child);
+  void onMessageAdded(in nsIMsgFolder parent, in nsIMsgDBHdr msg);
+
+  // "removed" flag covers removing both messages and child folders.
+  const folderListenerNotifyFlagValue removed = 0x2;
+  void onFolderRemoved(in nsIMsgFolder parent, in nsIMsgFolder child);
+  void onMessageRemoved(in nsIMsgFolder parent, in nsIMsgDBHdr msg);
+
+  const folderListenerNotifyFlagValue propertyChanged = 0x4;
+  void onFolderPropertyChanged(in nsIMsgFolder folder,
+                               in ACString property,
+                               in AUTF8String oldValue,
+                               in AUTF8String newValue);
+
+  const folderListenerNotifyFlagValue intPropertyChanged = 0x8;
+  // While this property handles long long (64bit wide) values,
+  // the Javascript engine will only pass values up to 2^53 to the consumers.
+  void onFolderIntPropertyChanged(in nsIMsgFolder folder,
+                                  in ACString property,
+                                  in long long oldValue,
+                                  in long long newValue);
+
+  const folderListenerNotifyFlagValue boolPropertyChanged = 0x10;
+  void onFolderBoolPropertyChanged(in nsIMsgFolder folder,
+                                   in ACString property,
+                                   in boolean oldValue,
+                                   in boolean newValue);
+
+  const folderListenerNotifyFlagValue unicharPropertyChanged = 0x20;
+  void onFolderUnicharPropertyChanged(in nsIMsgFolder folder,
+                                      in ACString property,
+                                      in AString oldValue,
+                                      in AString newValue);
+
+  const folderListenerNotifyFlagValue propertyFlagChanged = 0x40;
+  void onFolderPropertyFlagChanged(in nsIMsgDBHdr msg,
+                                   in ACString property,
+                                   in unsigned long oldFlag,
+                                   in unsigned long newFlag);
+
+  const folderListenerNotifyFlagValue event = 0x80;
+  void onFolderEvent(in nsIMsgFolder folder, in ACString event);
+
+  const folderListenerNotifyFlagValue all = 0xFFFFFFFF;
+};
diff --git a/comm/mailnews/base/public/nsIFolderLookupService.idl b/comm/mailnews/base/public/nsIFolderLookupService.idl
new file mode 100644
index 0000000000..fece4102ad
--- /dev/null
+++ b/comm/mailnews/base/public/nsIFolderLookupService.idl
@@ -0,0 +1,52 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgFolder;
+
+/**
+ * This service provides a way to lookup any nsIMsgFolder.
+ *
+ * When looking up folders by URL, note that the URL must be encoded to be a
+ * valid folder URL. Of particular note are the following requirements:
+ * - invalid characters in paths must be percent-encoded
+ * - the URL MUST NOT have a trailing slash (excepting root folders)
+ * - the case must match the expected value exactly
+ * An example of a valid URL is thus:
+ * imap://someuser%40google.com@imap.google.com/INBOX
+ *
+ * The contractid for this service is "@mozilla.org/mail/folder-lookup;1".
+ */
+[scriptable,uuid(f5ed5997-3945-48fc-a59d-d2191a94bb60)]
+interface nsIFolderLookupService : nsISupports
+{
+  /**
+   * Returns a folder with the given URL or null if no such folder exists.
+   *
+   * @param aUrl The folder URL
+   */
+  nsIMsgFolder getFolderForURL(in AUTF8String aUrl);
+
+  /**
+   * Returns a folder with the given URL.
+   * Will happily create and return an invalid (unparented) folder.
+   * Will return null if aUrl is not a folder url.
+   * NOTE: don't use this for new code! It's here purely to help
+   * transition away from RDF-based folder creation.
+   *
+   * @param aUrl The folder URL
+   */
+  nsIMsgFolder getOrCreateFolderForURL(in AUTF8String aUrl);
+
+  /**
+   * Set pretty name again from original name on all folders,
+   * typically used when locale changes.
+   */
+  void setPrettyNameFromOriginalAllFolders();
+};
+
+%{C++
+#define NSIFLS_CONTRACTID "@mozilla.org/mail/folder-lookup;1"
+%}
diff --git a/comm/mailnews/base/public/nsIIncomingServerListener.idl b/comm/mailnews/base/public/nsIIncomingServerListener.idl
new file mode 100644
index 0000000000..f2dd7faca5
--- /dev/null
+++ b/comm/mailnews/base/public/nsIIncomingServerListener.idl
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIMsgIncomingServer.idl"
+
+[scriptable, uuid(E6B64B86-90CB-11d3-8B02-0060B0FC04D2)]
+interface nsIIncomingServerListener : nsISupports {
+  /**
+   * Notification sent when a server is first loaded into the account manager.
+   *
+   * @param server Loaded server.
+   */
+  void onServerLoaded(in nsIMsgIncomingServer server);
+
+  /**
+   * Notification sent when a server is unloaded from the account manager.
+   *
+   * @param server Unloaded server.
+   */
+  void onServerUnloaded(in nsIMsgIncomingServer server);
+
+  /**
+   * Notification sent when a server hostname or username changes.
+   *
+   * @param server Server that was changed.
+   */
+  void onServerChanged(in nsIMsgIncomingServer server);
+};
diff --git a/comm/mailnews/base/public/nsIMailAuthModule.idl b/comm/mailnews/base/public/nsIMailAuthModule.idl
new file mode 100644
index 0000000000..83c0bdca0d
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMailAuthModule.idl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * nsIAuthModule provides GSSAPI, NTLM authentications, but it is not
+ * scriptable. nsIMailAuthModule wraps nsIAuthModule and makes it easy to use in
+ * JavaScript.
+ *
+ * The contract id is: "@mozilla.org/mail/auth-module;1".
+ *
+ * @see nsIAuthModule
+ */
+[scriptable, uuid(9895e904-642e-11eb-bb69-6b87832ac976)]
+interface nsIMailAuthModule : nsISupports {
+
+    /**
+     * Initialize an auth module. This is a combination of
+     * nsIAuthModule::CreateInstance and nsIAuthModule::Init. The aType argument
+     * is passed to CreateInstance, other arguments are passed to Init.
+     */
+    void init(in string        aType,
+              in ACString      aServiceName,
+              in unsigned long aServiceFlags,
+              in AString       aDomain,
+              in AString       aUsername,
+              in AString       aPassword);
+
+    /**
+     * Get the next token in a sequence of authentication steps.
+     * @param aInToken
+     *        A base64 encoded string, usually a server challenge.
+     * @returns
+     *        A base64 encoded string, usually a response to a server challenge.
+     */
+    ACString getNextToken(in ACString aInToken);
+};
diff --git a/comm/mailnews/base/public/nsIMailChannel.idl b/comm/mailnews/base/public/nsIMailChannel.idl
new file mode 100644
index 0000000000..f5785e6e65
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMailChannel.idl
@@ -0,0 +1,109 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "calIItipItem.idl"
+#include "nsIPropertyBag2.idl"
+#include "nsIMsgSMIMEHeaderSink.idl"
+
+interface nsIMailProgressListener;
+interface nsIWebProgress;
+interface nsIRequest;
+
+/**
+ * An interface that email-streaming channels can use to provide access to
+ * parsed message headers, message attachment info, and other metadata.
+ * The intended use is by QIing nsIChannel to nsIMailChannel.
+ */
+[scriptable, uuid(e4abdb58-54fa-4deb-8c43-714a69519b3a)]
+interface nsIMailChannel : nsISupports {
+  /**
+   * Called by MIME emitters to add a header to this mail channel.
+   * Do not call otherwise.
+   */
+  void addHeaderFromMIME(in AUTF8String name, in AUTF8String value);
+
+  /**
+   * Header names for this request, available at onStopRequest.
+   * The number of header names is the same as the number of header values,
+   * and they are in the same order.
+   */
+  readonly attribute Array<AUTF8String> headerNames;
+
+  /**
+   * Header values for this request, available at onStopRequest.
+   */
+  readonly attribute Array<AUTF8String> headerValues;
+
+  /**
+   * Called by MIME emitters to add attachment info to this mail channel.
+   * Do not call otherwise.
+   */
+  void handleAttachmentFromMIME(in AUTF8String contentType,
+                        in AUTF8String url,
+                        in AUTF8String displayName,
+                        in AUTF8String uri,
+                        in boolean aNotDownloaded);
+
+  /**
+   * Called by MIME emitters to add attachment info to this mail channel.
+   * Do not call otherwise.
+   */
+  void addAttachmentFieldFromMIME(in AUTF8String field, in AUTF8String value);
+
+  /**
+   * Attachments for this request, available at onStopRequest.
+   */
+  readonly attribute Array<nsIPropertyBag2> attachments;
+
+  /**
+   * The character set of the message, according to the MIME parser. Not the
+   * character set of the channel, which should always be UTF-8.
+   */
+  attribute AUTF8String mailCharacterSet;
+
+  /**
+   * The method property of iMIP attachments, as determined by the MIME parser.
+   * Not to be set after onStopRequest.
+   */
+  attribute AUTF8String imipMethod;
+
+  /**
+   * The actual iMIP invitation, as created by CalMIMEConverter.
+   * Not to be set after onStopRequest.
+   */
+  attribute calIItipItem imipItem;
+
+  /**
+   * Set this in onStartRequest to receive security status notifications.
+   */
+  attribute nsIMsgSMIMEHeaderSink smimeHeaderSink;
+
+  /**
+   * A listener for progress events. This object must also implement
+   * nsISupportsWeakReference.
+   */
+  attribute nsIMailProgressListener listener;
+};
+
+[scriptable, uuid(1286f969-1c20-422e-8247-233fe0d26ba5)]
+interface nsIMailProgressListener : nsISupports {
+  /**
+   * Receive a notification from the parser that it has finished outputting
+   * the headers to the channel.
+   */
+  void onHeadersComplete(in nsIMailChannel mailChannel);
+
+  /**
+   * Receive a notification from the parser that it has finished outputting
+   * the message body to the channel.
+   */
+  void onBodyComplete(in nsIMailChannel mailChannel);
+
+  /**
+   * Receive a notification from the parser that it has finished outputting
+   * the attachment information to the channel.
+   */
+  void onAttachmentsComplete(in nsIMailChannel mailChannel);
+};
diff --git a/comm/mailnews/base/public/nsIMapiRegistry.idl b/comm/mailnews/base/public/nsIMapiRegistry.idl
new file mode 100644
index 0000000000..c4a2c6d545
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMapiRegistry.idl
@@ -0,0 +1,50 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface mozIDOMWindowProxy;
+
+/**
+ * This interface provides support for registering Mozilla as the default
+ * Mail Client. This interface can also be used to get/set the user preference
+ * for the default Mail Client.
+ *
+ */
+
+[scriptable, uuid(47D707C3-4369-46A6-A053-5118E12579D6)]
+interface nsIMapiRegistry: nsISupports {
+
+   /** This is set to TRUE if Mozilla is the default mail application
+    */
+   attribute boolean isDefaultMailClient;
+
+   /* Set to TRUE if Mozilla is the default news application */
+   attribute boolean isDefaultNewsClient;
+
+   /* Set to TRUE if we are the default feed/rss application */
+   attribute boolean isDefaultFeedClient;
+
+   /** This is set TRUE only once per session.
+    */
+   readonly attribute boolean showDialog;
+
+   /** This will bring the dialog asking the user if he/she wants to set
+    * Mozilla as default Mail Client.
+    * Call this only if Mozilla is not the default Mail client
+    */
+   void showMailIntegrationDialog(in mozIDOMWindowProxy parentWindow);
+
+   /* After being installed, when we first launch, make sure we add the correct
+    OS registry entries to make us show up as registered mail and news client
+    in the OS
+   */
+
+   void registerMailAndNewsClient();
+};
+
+%{C++
+#define NS_IMAPIREGISTRY_CONTRACTID    "@mozilla.org/mapiregistry;1"
+#define NS_IMAPIREGISTRY_CLASSNAME "Mozilla MAPI Registry"
+%}
diff --git a/comm/mailnews/base/public/nsIMessenger.idl b/comm/mailnews/base/public/nsIMessenger.idl
new file mode 100644
index 0000000000..437879782a
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMessenger.idl
@@ -0,0 +1,127 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsrootidl.idl"
+#include "nsIMsgWindow.idl"
+#include "nsIMsgIdentity.idl"
+
+interface nsIMsgDBHdr;
+interface mozIDOMWindowProxy;
+interface nsITransactionManager;
+interface nsIMsgMessageService;
+interface nsIFile;
+interface nsIUrlListener;
+
+[scriptable, uuid(01b967c8-b289-4e32-ad46-6eb7c89d4106)]
+interface nsIMessenger : nsISupports {
+
+    const long eUnknown = 0;
+    const long eDeleteMsg = 1;
+    const long eMoveMsg = 2;
+    const long eCopyMsg = 3;
+    const long eMarkAllMsg = 4;
+
+    readonly attribute nsITransactionManager transactionManager;
+
+    void setWindow(in mozIDOMWindowProxy ptr, in nsIMsgWindow msgWindow);
+
+    boolean canUndo();
+    boolean canRedo();
+    unsigned long getUndoTransactionType();
+    unsigned long getRedoTransactionType();
+    void undo(in nsIMsgWindow msgWindow);
+    void redo(in nsIMsgWindow msgWindow);
+
+    /**
+     * Saves a given message to a file or template.
+     *
+     * @param aURI         The URI of the message to save
+     * @param aAsFile      If true, save as file, otherwise save as a template
+     * @param aIdentity    When saving as a template, this is used to determine
+     *                     the location to save the template to.
+     * @param aMsgFilename When saving as a file, the filename to save the
+     *                     message as, or the default filename for the file
+     *                     picker.
+     * @param aBypassFilePicker
+     *                     If not specified or false, this function will show
+     *                     a file picker when saving as a file. If true, no
+     *                     file picker will be shown.
+     */
+    void saveAs(in AUTF8String aURI, in boolean aAsFile,
+                in nsIMsgIdentity aIdentity, in AString aMsgFilename,
+                [optional] in boolean aBypassFilePicker);
+
+    /**
+     * Save the given messages as files in a folder - the user will be prompted
+     * for which folder to use.
+     * @param count message count
+     * @param filenameArray the filenames to use
+     * @param messageUriArray uris of the messages to save
+     */
+    void saveMessages(in Array<AString> filenameArray,
+                      in Array<AUTF8String> messageUriArray);
+
+    void saveAttachment(in AUTF8String contentType,
+                        in AUTF8String url,
+                        in AUTF8String displayName,
+                        in AUTF8String messageUri,
+                        in boolean isExternalAttachment);
+    void saveAllAttachments(in Array<AUTF8String> contentTypeArray,
+                            in Array<AUTF8String> urlArray,
+                            in Array<AUTF8String> displayNameArray,
+                            in Array<AUTF8String> messageUriArray);
+
+    void saveAttachmentToFile(in nsIFile aFile,
+                              in AUTF8String aUrl,
+                              in AUTF8String aMessageUri,
+                              in AUTF8String aContentType,
+                              in nsIUrlListener aListener);
+
+    /**
+     * For a single message and attachments, save these attachments to a file, and
+     *  remove from the message. No warning windows will appear, so this is
+     *  suitable for use in test and filtering.
+     *
+     * @param aDestFolder       Folder to save files in
+     * @param aCount            Number of attachments to save
+     * @param aContentTypeArray Content types of the attachments
+     * @param aUrlArray         Urls for the attachments
+     * @param aDisplayNameArray Files names to save attachments to. Unique
+     *                           names will be created if needed.
+     * @param aMessageUriArray  Uri for the source message
+     * @param aListener         Listener to inform of start and stop of detach
+     */
+    void detachAttachmentsWOPrompts(in nsIFile aDestFolder,
+                                    in Array<AUTF8String> aContentTypeArray,
+                                    in Array<AUTF8String> aUrlArray,
+                                    in Array<AUTF8String> aDisplayNameArray,
+                                    in Array<AUTF8String> aMessageUriArray,
+                                    in nsIUrlListener aListener);
+
+    void detachAttachment(in AUTF8String contentType,
+                          in AUTF8String url,
+                          in AUTF8String displayName,
+                          in AUTF8String messageUri,
+                          in boolean saveFirst,
+                          [optional] in boolean withoutWarning);
+    void detachAllAttachments(in Array<AUTF8String> contentTypeArray,
+                              in Array<AUTF8String> urlArray,
+                              in Array<AUTF8String> displayNameArray,
+                              in Array<AUTF8String> messageUriArray,
+                              in boolean saveFirst,
+                              [optional] in boolean withoutWarning);
+    // saveAttachmentToFolder is used by the drag and drop code to drop an attachment to a destination folder
+    // We need to return the actual file path (including the filename).
+    nsIFile saveAttachmentToFolder(in AUTF8String contentType,
+                                   in AUTF8String url,
+                                   in AUTF8String displayName,
+                                   in AUTF8String messageUri,
+                                   in nsIFile aDestFolder);
+
+    nsIMsgDBHdr msgHdrFromURI(in AUTF8String aUri);
+
+    AString formatFileSize(in unsigned long long aPos, [optional] in boolean aUseKB);
+};
diff --git a/comm/mailnews/base/public/nsIMessengerMigrator.idl b/comm/mailnews/base/public/nsIMessengerMigrator.idl
new file mode 100644
index 0000000000..e5a74123d3
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMessengerMigrator.idl
@@ -0,0 +1,14 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(54818d98-1dd2-11b2-82aa-a9197f997503)]
+interface nsIMessengerMigrator: nsISupports {
+  /* migrate old mailnews prefs to the 5.x world */
+  void UpgradePrefs();
+
+  void createLocalMailAccount(in boolean migrating);
+};
diff --git a/comm/mailnews/base/public/nsIMessengerOSIntegration.idl b/comm/mailnews/base/public/nsIMessengerOSIntegration.idl
new file mode 100644
index 0000000000..99c5127701
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMessengerOSIntegration.idl
@@ -0,0 +1,26 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * Common interfaces to integrate with different platforms, how they are
+ * implemented depends on the specific platform.
+ */
+[scriptable, uuid(d9e45fee-1dd1-11b2-938c-9147855ed837)]
+interface nsIMessengerOSIntegration : nsISupports {
+  /**
+   * Update the unread count.
+   * @param unreadCount - The number of unread messages.
+   * @param unreadTooltip - The tooltip for the unread count.
+   */
+  void updateUnreadCount(in unsigned long unreadCount,
+                         in AString unreadTooltip);
+
+  /**
+   * Use this to do necessary clean up on exit, e.g. reset the badge/tray icon.
+   */
+  void onExit();
+};
diff --git a/comm/mailnews/base/public/nsIMessengerWindowService.idl b/comm/mailnews/base/public/nsIMessengerWindowService.idl
new file mode 100644
index 0000000000..9056a734a8
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMessengerWindowService.idl
@@ -0,0 +1,17 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+[scriptable, uuid(113a1a5a-1dd2-11b2-b1b7-a85ccc06c8ce)]
+interface nsIMessengerWindowService : nsISupports {
+  /**
+   * @param aWindowType  the type of window you want to create. i.e. "mail:3pane"
+   * @param aFolderURI   the folder resource you want pre-selected (if any)
+   * @param aMsgKey      a particular message you may want selected in that folder (if any)
+   */
+  void openMessengerWindowWithUri(in string aWindowType, in AUTF8String aFolderURI, in nsMsgKey aMsgKey);
+};
diff --git a/comm/mailnews/base/public/nsIMessengerWindowsIntegration.idl b/comm/mailnews/base/public/nsIMessengerWindowsIntegration.idl
new file mode 100644
index 0000000000..86f33dd651
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMessengerWindowsIntegration.idl
@@ -0,0 +1,16 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+interface mozIDOMWindowProxy;
+
+#include "nsIBaseWindow.idl"
+#include "nsIMessengerOSIntegration.idl"
+
+[scriptable, uuid(e14eb9fe-e05e-4b78-bd31-5b7e1497f91b)]
+interface nsIMessengerWindowsIntegration : nsIMessengerOSIntegration {
+  void hideWindow(in nsIBaseWindow aWindow);
+
+  void showWindow(in mozIDOMWindowProxy aWindow);
+};
diff --git a/comm/mailnews/base/public/nsIMsgAccount.idl b/comm/mailnews/base/public/nsIMsgAccount.idl
new file mode 100644
index 0000000000..aa59222824
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgAccount.idl
@@ -0,0 +1,86 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIMsgIncomingServer.idl"
+#include "nsIMsgIdentity.idl"
+
+/**
+ * An account consists of an incoming server and one or more
+ * outgoing identities. An account is identified by a key,
+ * which is the <account> string in the account preferences,
+ * such as in mail.account.<account>.identities.
+ */
+
+[scriptable, uuid(84181351-4ec8-4ca8-8439-5c68cc591177)]
+interface nsIMsgAccount : nsISupports {
+
+  /// Internal key identifying itself
+  attribute ACString key;
+
+  /// Incoming server stuff
+  attribute nsIMsgIncomingServer incomingServer;
+
+  /// Outgoing identity list (array of nsIMsgIdentity's)
+  readonly attribute Array<nsIMsgIdentity> identities;
+
+  /// The default identity for this account.
+  attribute nsIMsgIdentity defaultIdentity;
+
+  /// Add a new identity to this account
+  void addIdentity(in nsIMsgIdentity identity);
+
+  /// Remove an identity from this account
+  void removeIdentity(in nsIMsgIdentity identity);
+
+  /// Clear all user preferences associated with an account.
+  void clearAllValues();
+
+  /// Name in javascript
+  AString toString();
+
+  /**
+   * Create the server, with error returns.
+   *
+   * Normally each valid account also has a valid server.
+   *
+   * If an extension that creates a server type failed to load, then we
+   * may have an existing account without a valid server. We don't want
+   * to simply delete that account, as that would make the user re-enter
+   * all of the account information after what may be a temporary
+   * update glitch. But we also don't want to leave junk lying around
+   * forever. So what we do is note the time when we first noticed
+   * that the server was unavailable. After a period of time set
+   * in a preference, if the server is still unavailable then delete
+   * the associated account.
+   *
+   * Accounts with invalid server are not shown in any way by the account
+   * manager. But if the server becomes available (for example if an extension
+   * is loaded), then the account will reappear when accounts are loaded.
+   *
+   * Preference definitions:
+   *
+   * mail.server.serverN.secondsToLeaveUnavailable
+   * mail.server.serverN.timeFoundUnavailable
+   *
+   * secondsToLeaveUnavailable: is set by the extension to indicate the
+   * delay, in seconds, between first detection that a server is
+   * unavailable, and the time it can be deleted. This should be set
+   * by the extension when the server is created. If missing, treat as 0.
+   * A typical value would be 2592000 (30 days)(24 hr/day)(3600 seconds/hr)
+   *
+   * timeFoundUnavailable: is set by core code the first time that a
+   * server is detected as unavailable, using now() converted to seconds.
+   * If that time + secondsToLeaveUnavailable is exceeded, core code may
+   * delete the server and its associated account (though for now we default
+   * to the previous behavior, which is to just delete the account).
+   *
+   * @throws NS_ERROR_NOT_AVAILABLE if the server component type could not
+   *           be created
+   *         NS_ERROR_ALREADY_INITIALIZED if the server is already created
+   *         (Other errors may also be possible)
+  */
+  void createServer();
+};
diff --git a/comm/mailnews/base/public/nsIMsgAccountManager.idl b/comm/mailnews/base/public/nsIMsgAccountManager.idl
new file mode 100644
index 0000000000..39f4aecd79
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgAccountManager.idl
@@ -0,0 +1,256 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIMsgAccount.idl"
+#include "nsIMsgIdentity.idl"
+#include "nsIMsgIncomingServer.idl"
+#include "nsIIncomingServerListener.idl"
+#include "nsIMsgFolder.idl"
+
+interface nsIMsgFolderCache;
+interface nsIFolderListener;
+
+[scriptable, uuid(d5ab0eea-49c5-42f2-b2e6-8ad306606d8b)]
+interface nsIMsgAccountManager : nsISupports {
+
+  ACString getUniqueAccountKey();
+
+  nsIMsgAccount createAccount();
+  /*
+   * Return the account with the provided key, or null if none found.
+   */
+  nsIMsgAccount getAccount(in ACString key);
+
+  /**
+   * Removes the account from the list of accounts.
+   *
+   * @param aAccount      the account to remove
+   * @param aRemoveFiles  remove data directory (local directory) of this account
+   */
+  void removeAccount(in nsIMsgAccount aAccount, [optional] in boolean aRemoveFiles);
+
+  /*
+   * creates a new identity and assigns it a new, unique "key"
+   */
+  nsIMsgIdentity createIdentity();
+
+  /**
+   * Scan the preferences to find a unique server key.
+   */
+  ACString getUniqueServerKey();
+
+  /*
+   * creates a new server and assigns it a new, unique "key"
+   * the given type will be used to construct a ContractID
+   *
+   *  @param type "imap", "pop3", "nntp", "none", "rss", "generic"
+   * (suffix of contract ID @mozilla.org/messenger/server;1?type= )
+   */
+  nsIMsgIncomingServer createIncomingServer(in ACString username,
+                                            in ACString hostname,
+                                            in ACString type);
+
+  /**
+   * Removes the server from the list of servers
+   *
+   * @param aServer        server to remove
+   * @param aRemoveFiles   remove directory from profile
+   *
+   * @throws NS_ERROR_FAILURE if server not found
+   */
+  void removeIncomingServer(in nsIMsgIncomingServer aServer,
+                            in boolean aRemoveFiles);
+  /*
+   * get the identity with the given key
+   * if the identity does not exist, it will be created
+   */
+  nsIMsgIdentity getIdentity(in ACString key);
+
+  /*
+   * Gets the existing incoming server with the given key
+   * if the server's type does not exist in the preference,
+   * an error is returned/thrown
+   */
+  nsIMsgIncomingServer getIncomingServer(in ACString key);
+
+  /* account list stuff */
+
+  /**
+   * Returns the account that was marked as the default one.
+   * Only some server types can serve as default account.
+   * If there is no such account, null is returned.
+   * You can only set the defaultAccount to an
+   * account already in the account manager.
+   */
+  attribute nsIMsgAccount defaultAccount;
+
+  /**
+   * Ordered list of all accounts, by the order they are in the prefs.
+   * Accounts with hidden servers are not returned.
+   * array of nsIMsgAccount
+   */
+  readonly attribute Array<nsIMsgAccount> accounts;
+
+  /* list of all identities in all accounts
+   * array of nsIMsgIdentity
+   */
+  readonly attribute Array<nsIMsgIdentity> allIdentities;
+
+  /* list of all servers in all accounts, except for hidden and IM servers
+   * array of nsIMsgIncomingServer
+   */
+  readonly attribute Array<nsIMsgIncomingServer> allServers;
+
+  /* summary of summary files folder cache */
+  readonly attribute nsIMsgFolderCache folderCache;
+
+  /* are we shutting down */
+  readonly attribute boolean shutdownInProgress;
+
+  /**
+   * for preventing unauthenticated users from seeing header information
+   */
+  attribute boolean userNeedsToAuthenticate;
+  /*
+   * search for the server with the given username, hostname, and type
+   * the type is the same as is specified in the preferences,
+   * i.e. "imap", "pop3", "none", or "nntp"
+   */
+  nsIMsgIncomingServer findServer(in ACString userName,
+                                  in ACString hostname,
+                                  in ACString type,
+                                  [optional] in long port);
+
+  /*
+   * search for the server with the given uri
+   * an analog to FindServer()
+   */
+  nsIMsgIncomingServer findServerByURI(in nsIURI aURI);
+
+  /**
+   * find the index of this server in the (ordered) list of accounts
+   */
+  long FindServerIndex(in nsIMsgIncomingServer server);
+
+  /**
+   * Finds an account for the given incoming server.
+   *
+   * @param server  An incoming server to find the account for.
+   * @return        If found, the nsIMsgAccount representing the account found.
+   *                Otherwise returns null.
+   */
+  nsIMsgAccount FindAccountForServer(in nsIMsgIncomingServer server);
+
+  /* given a server, return all identities in accounts that have this server
+   * returns an array of nsIMsgIdentity
+   */
+  Array<nsIMsgIdentity> getIdentitiesForServer(in nsIMsgIncomingServer server);
+
+  /**
+   * given a server, return the first identity in accounts that have this server
+   */
+  nsIMsgIdentity getFirstIdentityForServer(in nsIMsgIncomingServer server);
+
+  /* given an identity, return all servers in accounts that have
+   * this identity
+   * returns an array of nsIMsgIncomingServer
+   */
+  Array<nsIMsgIncomingServer> getServersForIdentity(in nsIMsgIdentity identity);
+
+  /* there is a special server "Local Folders" that is guaranteed to exist.
+   * this will allow you to get */
+  attribute nsIMsgIncomingServer localFoldersServer;
+
+  // Create the account for that special server.
+  void createLocalMailAccount();
+
+  /**
+   * Kicks off the creation of all accounts. You do not need to call this and
+   * all accounts should be loaded lazily if you use any of the above.
+   */
+  void loadAccounts();
+
+  /** Frees all the account manager data structures. */
+  void unloadAccounts();
+
+  /**
+   * When the server for an account could not be loaded, typically because the
+   * extension providing it could not be loaded, it is deactivated for a period
+   * of time as documented in nsIMsgAccount.idl. The server is normally only
+   * rechecked at startup but this function can be used to recheck all servers
+   * at any time to avoid having to restart to reactivate an account.
+   */
+  void reactivateAccounts();
+
+  void setSpecialFolders();
+
+  void loadVirtualFolders();
+
+  void WriteToFolderCache(in nsIMsgFolderCache folderCache);
+  void saveVirtualFolders();
+  void closeCachedConnections();
+  void shutdownServers();
+
+  void CleanupOnExit();
+  void SetFolderDoingEmptyTrash(in nsIMsgFolder folder);
+  boolean GetEmptyTrashInProgress();
+
+  void SetFolderDoingCleanupInbox(in nsIMsgFolder folder);
+  boolean GetCleanupInboxInProgress();
+
+  void addRootFolderListener(in nsIFolderListener listener);
+  void removeRootFolderListener(in nsIFolderListener listener);
+
+  // these are going away in favor of add/removeRootFolderListener
+  void addIncomingServerListener(in nsIIncomingServerListener serverListener);
+  void removeIncomingServerListener(in nsIIncomingServerListener serverListener);
+
+  // these are going away in favor of nsIMsgFolder::NotifyEvent(in ACString event);
+  // XXX what does this mean? There is no such function yet.
+  void notifyServerLoaded(in nsIMsgIncomingServer server);
+  void notifyServerUnloaded(in nsIMsgIncomingServer server);
+  void notifyServerChanged(in nsIMsgIncomingServer server);
+
+  // force account info out to prefs file
+  void saveAccountInfo();
+
+  ACString getChromePackageName(in ACString aExtensionName);
+
+  /// Enumerate all incoming servers and their folders and return in an array.
+  readonly attribute Array<nsIMsgFolder> allFolders;
+
+  /**
+   * Iterates over all folders looking for one with the passed in path,
+   * and returns the uri for the matching folder. In the future,
+   * the folder lookup service will provide this functionality.
+   *
+   * @param aLocalPath path of the folder whose uri we want.
+   * @return the URI of the folder that corresponds to aLocalPath
+   */
+  AUTF8String folderUriForPath(in nsIFile aLocalPath);
+
+  // Used to sort servers (accounts) for e.g. the folder pane
+  long getSortOrder(in nsIMsgIncomingServer server);
+
+  /**
+   * Sets new order of accounts.
+   *
+   * @param accountKeys - Account keys in the new preferred order.
+   */
+  void reorderAccounts(in Array<ACString> accountKeys);
+};
+
+%{C++
+#define MAILNEWS_ACCOUNTMANAGER_EXTENSIONS "mailnews-accountmanager-extensions"
+%}
+
+[scriptable, uuid(70032DE0-CD59-41ba-839D-FC1B65367EE7)]
+interface nsIMsgAccountManagerExtension : nsISupports
+{
+  readonly attribute ACString name;   // examples:  mdn
+  boolean showPanel(in nsIMsgIncomingServer server);
+  readonly attribute ACString chromePackageName;  // example:  messenger, chrome://messenger/content/am-mdn.xhtml and chrome://messenger/locale/am-mdn.properties
+};
diff --git a/comm/mailnews/base/public/nsIMsgAsyncPrompter.idl b/comm/mailnews/base/public/nsIMsgAsyncPrompter.idl
new file mode 100644
index 0000000000..0e1a68846b
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgAsyncPrompter.idl
@@ -0,0 +1,79 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgAsyncPromptListener;
+
+/**
+ * The nsIMsgAsyncPrompter is intended to provide a way to make asynchronous
+ * message prompts into synchronous ones - so that the user is only prompted
+ * with one at a time.
+ */
+[scriptable, uuid(15f67d0f-947a-4a1e-8f72-6ab7162b4b9c)]
+interface nsIMsgAsyncPrompter : nsISupports {
+  /**
+   * Queues an async prompt request. If there are none queued then this will be
+   * actioned straight away, otherwise the prompt will be queued for action
+   * once previous prompt(s) have been cleared.
+   *
+   * Queued prompts using the same aKey may be amalgamated into one prompt to
+   * save repeated prompts to the user.
+   *
+   * @param aKey    A key to determine whether or not the queued prompts can
+   *                be combined.
+   * @param aPromptImmediately If the user is retrying a failed password, we
+   *                           need to prompt right away, even if there is a
+   *                           prompt up, or prompts queued up. Note that
+   *                           immediately may not be synchronously, on OS/X.
+   * @param aCaller An nsIMsgAsyncPromptListener to call back to when the prompt
+   *                is ready to be made.
+   */
+  void queueAsyncAuthPrompt(in ACString aKey, in boolean aPromptImmediately,
+                            in nsIMsgAsyncPromptListener aCaller);
+};
+
+[scriptable, function, uuid(acca94c9-378e-46e3-9a91-6655bf9c91a3)]
+interface nsIMsgAsyncPromptCallback : nsISupports {
+  /**
+   * Called when an auth result is available. Can be passed as a function.
+   *
+   * @param aResult   True if there is auth information available following the
+   *                    prompt, false otherwise.
+   */
+  void onAuthResult(in boolean aResult);
+};
+
+/**
+ * This is used in combination with nsIMsgAsyncPrompter.
+ */
+[scriptable, uuid(fb5307a3-39d0-462e-92c8-c5c288a2612f)]
+interface nsIMsgAsyncPromptListener : nsISupports {
+  /**
+   * This method has been deprecated, please use onPromptStartAsync instead.
+   */
+  boolean onPromptStart();
+
+  /**
+   * Called when the listener should do its prompt. This can happen
+   * synchronously or asynchronously, but in any case when done the callback
+   * method should be called.
+   *
+   * @param aCallback   The callback to execute when auth prompt has completed.
+   */
+  void onPromptStartAsync(in nsIMsgAsyncPromptCallback aCallback);
+
+  /**
+   * Called in the case that the queued prompt was combined with another and
+   * there is now authentication information available.
+   */
+  void onPromptAuthAvailable();
+
+  /**
+   * Called in the case that the queued prompt was combined with another but
+   * the prompt was canceled.
+   */
+  void onPromptCanceled();
+};
diff --git a/comm/mailnews/base/public/nsIMsgBiffManager.idl b/comm/mailnews/base/public/nsIMsgBiffManager.idl
new file mode 100644
index 0000000000..168ce1ace1
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgBiffManager.idl
@@ -0,0 +1,18 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIMsgIncomingServer.idl"
+
+[scriptable, uuid(17275D52-1622-11d3-8A84-0060B0FC04D2)]
+interface nsIMsgBiffManager : nsISupports {
+
+  void init();
+  void addServerBiff(in nsIMsgIncomingServer server);
+  void removeServerBiff(in nsIMsgIncomingServer server);
+  void forceBiff(in nsIMsgIncomingServer server);
+  void forceBiffAll();
+  void shutdown();
+};
diff --git a/comm/mailnews/base/public/nsIMsgContentPolicy.idl b/comm/mailnews/base/public/nsIMsgContentPolicy.idl
new file mode 100644
index 0000000000..882a39b49b
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgContentPolicy.idl
@@ -0,0 +1,35 @@
+/* -*- mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(c29b2fd3-64d0-4083-a096-c20a9b847a99)]
+
+/**
+ * This interface provide functions which help extension developers
+ * add their customized schema to the exposed protocls of nsMsgContentPolicy.
+ * By default, a list of existing protocols (such as imap and nntp)
+ * are allowed to process urls locally, while non-matching urls are required
+ * to be processed as external.
+ * This interface allows additional protocols to be added to
+ * the list of protocols that are processed locally.
+ * Typically this would be used in cases where a new messaging protocol
+ * is being added by an extension.
+ */
+interface nsIMsgContentPolicy : nsISupports {
+  /**
+   * Add the specific aScheme to nsMsgContentPolicy's exposed protocols.
+   *
+   * @param aScheme scheme who will be added to nsMsgContentPolicy's exposed protocols
+   */
+  void addExposedProtocol(in ACString aScheme);
+
+  /**
+   * Remove the specific aScheme from nsMsgContentPolicy's exposed protocols.
+   *
+   * @param aScheme scheme who will be removed from nsMsgContentPolicy's exposed protocols
+   */
+  void removeExposedProtocol(in ACString aScheme);
+};
diff --git a/comm/mailnews/base/public/nsIMsgCopyService.idl b/comm/mailnews/base/public/nsIMsgCopyService.idl
new file mode 100644
index 0000000000..b28ee9170c
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgCopyService.idl
@@ -0,0 +1,116 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsrootidl.idl"
+#include "nsISupports.idl"
+#include "nsIMsgFolder.idl"
+#include "nsIMsgCopyServiceListener.idl"
+
+interface nsIMsgDBHdr;
+interface nsIMsgWindow;
+interface nsIFile;
+
+/**
+ * nsIMsgCopyService is a central point for kicking off message and folder
+ * copy/move operations.
+ * Each operation is queued up and executed in sequence. The actual work is
+ * handled by folder code in an asynchronous fashion. The folder indicates
+ * completion by calling notifyCompletion().
+ *
+ * If the operation was initiated with a non-null nsIMsgCopyServiceListener,
+ * its OnStartCopy() and OnStopCopy() methods will be called when the
+ * operation begins/ends. Any errors are communicated via the result code
+ * parameter passed to OnStopCopy().
+ */
+[scriptable, uuid(f21e428b-73c5-4607-993b-d37325b33722)]
+interface nsIMsgCopyService : nsISupports {
+
+  /**
+   * Copies or moves existing messages from source folder to destination folder.
+   *
+   * @param srcFolder  Source folder of an operation.
+   * @param messages   The array of nsIMsgHdrs in source folder which will be moved/copied.
+   * @param dstFolder  Destination folder of operation.
+   * @param isMove     false for copy operation, true for move operation.
+   * @param listener   Listener which receive operation notifications
+   * @param msgWindow  Window for notification callbacks, can be null.
+   * @param allowUndo  Specifies if this operation will be done as an transaction
+   *                   that can be undone.
+   */
+  void copyMessages(in nsIMsgFolder srcFolder,
+                    in Array<nsIMsgDBHdr> messages,
+                    in nsIMsgFolder dstFolder,
+                    in boolean isMove,
+                    in nsIMsgCopyServiceListener listener,
+                    in nsIMsgWindow msgWindow,
+                    in boolean allowUndo);
+
+  /**
+   * Copies or moves a folder into an existing destination folder.
+   *
+   * @param srcFolder  The nsIMsgFolder which will be moved/copied.
+   * @param dstFolder  The destination folder of operation.
+   * @param isMove     false for copy operation, true for move operation.
+   * @param listener   Listener which receive operation notifications.
+   * @param msgWindow  Window for notification callbacks, can be null.
+   */
+  void copyFolder(in nsIMsgFolder srcFolder,
+                  in nsIMsgFolder dstFolder,
+                  in boolean isMove,
+                  in nsIMsgCopyServiceListener listener,
+                  in nsIMsgWindow msgWindow);
+
+  /**
+   * Copies message in rfc format from file to folder.
+   *
+   * @param aFile             A file which contains message in rfc format which
+   *                          will copied to destFolder.
+   * @param dstFolder         Destination folder where a message will be copied.
+   * @param msgToReplace      Header which identifies a message to use as a source
+   *                          of message properties, or null. For example, when
+   *                          deleting an attachment, the processed message is
+   *                          stored in a file, but the metadata should be copied
+   *                          from the original message. This method will NOT delete
+   *                          the original message.
+   * @param isDraftOrTemplate Specifies whether a message is a stored in draft
+   *                          folder or not. If is true listener should
+   *                          implement GetMessageId and return unique id for
+   *                          message in destination folder. This is important
+   *                          for IMAP servers which doesn't support uidplus.
+   *                          If destination folder contains message with the
+   *                          same message-id then it is possible that listener
+   *                          get wrong message key in callback
+   *                          nsIMsgCopyServiceListener::SetMessageKey.
+   * @param aMsgFlags         Message flags which will be set after message is
+   *                          copied
+   * @param aMsgKeywords      Keywords which will be set for newly copied
+   *                          message.
+   * @param listener          Listener which receive copy notifications.
+   * @param msgWindow         Window for notification callbacks, can be null.
+   */
+  void copyFileMessage(in nsIFile aFile,
+                       in nsIMsgFolder dstFolder,
+                       in nsIMsgDBHdr msgToReplace,
+                       in boolean isDraftOrTemplate,
+                       in unsigned long aMsgFlags,
+                       in ACString aMsgKeywords,
+                       in nsIMsgCopyServiceListener listener,
+                       in nsIMsgWindow msgWindow);
+
+  /**
+   * Notify the message copy service that the destination folder has finished
+   * it's messages copying operation so that the copy service can continue
+   * copying the rest of the messages if there are more to copy with.
+   * aSupport and dstFolder uniquely identify a copy service request.
+   *
+   * @param aSupport   The originator of CopyMessages or copyFileMessage; it can
+   *                   be either a nsIMsgFolder or a nsIFile
+   * @param dstFolder  The destination folder which performs the copy operation
+   * @param result     The result of the copy operation
+   */
+  void notifyCompletion(in nsISupports aSupport,
+                        in nsIMsgFolder dstFolder,
+                        in nsresult result);
+};
diff --git a/comm/mailnews/base/public/nsIMsgCopyServiceListener.idl b/comm/mailnews/base/public/nsIMsgCopyServiceListener.idl
new file mode 100644
index 0000000000..0c915c8d38
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgCopyServiceListener.idl
@@ -0,0 +1,55 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsrootidl.idl"
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+[scriptable, uuid(da6b9843-5464-4630-b121-c5970aa3d6ed)]
+interface nsIMsgCopyServiceListener : nsISupports {
+
+    /**
+     * Notify the observer that the message has started to be copied. This
+     * method is called only once, at the beginning of a message
+     * copyoperation.
+     */
+    void OnStartCopy();
+
+    /**
+     * Notify the observer that progress as occurred for the message copy
+     * aProgress -
+     * aProgressMax -
+     */
+    void OnProgress(in uint32_t aProgress,
+                    in uint32_t aProgressMax);
+
+    /**
+     * Setting newly created message key. This method is tailored specifically
+     * for nsIMsgCopyService::copyFileMessage() when saving Drafts/Templates.
+     * We need to have a way to inform the client what's the key of the newly
+     * created message.
+     * aKey -
+     */
+    void SetMessageKey(in nsMsgKey aKey);
+
+    /**
+     * Getting the file message message ID. This method is tailored
+     * specifically for nsIMsgCopyService::copyFileMessage() when saving
+     * Drafts/Templates. In order to work with imap server which doesn't
+     * support uidplus we have to use search command to retrieve the key of
+     * newly created message. Message ID generated by the compose guarantee its
+     * uniqueness.
+     * aMessageId -
+     */
+    void GetMessageId(out ACString aMessageId);
+
+    /**
+     * Notify the observer that the message copied operation has completed.
+     * This method is called regardless of whether the the operation was
+     * successful.
+     * aStatus - indicate whether the operation was succeeded
+     */
+    void OnStopCopy(in nsresult aStatus);
+};
diff --git a/comm/mailnews/base/public/nsIMsgCustomColumnHandler.idl b/comm/mailnews/base/public/nsIMsgCustomColumnHandler.idl
new file mode 100644
index 0000000000..1b5287c56e
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgCustomColumnHandler.idl
@@ -0,0 +1,40 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsITreeView.idl"
+
+interface nsIMsgDBHdr;
+
+    /* //TODO JavaDoc
+       When implementing a js custom column handler (of type nsITreeView) you must implement the following
+       functions:
+       1. isEditable
+       2. GetCellProperties
+       3. GetImageSrc
+       4. GetCellText
+       5. CycleCell
+       6. GetSortStringForRow
+       7. GetSortLongForRow
+       8. isString
+
+       You can, at your option, implement
+       9.  GetRowProperties.
+
+       With Bug 1192696, Grouped By Sort was implemented for custom columns.
+       Implementers should consider that the value returned by GetSortStringForRow
+       will be displayed in the grouped header row, as well as be used as the
+       sort string.
+
+      If implementing a c++ custom column handler, you must define all
+      nsITreeView and nsIMsgCustomColumnHandler methods.
+    */
+
+[scriptable, uuid(00f75b13-3ac4-4a17-a8b9-c6e4dd1b3f32)]
+interface nsIMsgCustomColumnHandler : nsITreeView
+{
+  AString getSortStringForRow(in nsIMsgDBHdr aHdr);
+  unsigned long getSortLongForRow(in nsIMsgDBHdr aHdr);
+  boolean isString();
+};
diff --git a/comm/mailnews/base/public/nsIMsgDBView.idl b/comm/mailnews/base/public/nsIMsgDBView.idl
new file mode 100644
index 0000000000..1c824c58f9
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgDBView.idl
@@ -0,0 +1,558 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+interface nsIMsgFolder;
+interface nsIMsgWindow;
+interface nsIMessenger;
+interface nsIMsgDBHdr;
+interface nsIMsgThread;
+interface nsIMsgDBViewCommandUpdater;
+interface nsIMsgJSTree;
+interface nsIMsgDatabase;
+interface nsIMsgSearchSession;
+interface nsIMsgEnumerator;
+interface nsIMsgCustomColumnHandler;
+
+typedef long nsMsgViewNotificationCodeValue;
+typedef long nsMsgViewCommandCheckStateValue;
+typedef long nsMsgViewCommandTypeValue;
+typedef long nsMsgNavigationTypeValue;
+
+[scriptable, uuid(682a18be-fd18-11d4-a5be-0060b0fc04b7)]
+interface nsMsgViewSortOrder : nsISupports
+{
+  const nsMsgViewSortOrderValue none = 0;
+  const nsMsgViewSortOrderValue ascending = 1;
+  const nsMsgViewSortOrderValue descending = 2;
+};
+
+[scriptable, uuid(f28a1cdf-06c3-4e98-8f66-f49991670071)]
+interface nsMsgViewType : nsISupports {
+  const nsMsgViewTypeValue eShowAllThreads = 0;
+  const nsMsgViewTypeValue eShowThreadsWithUnread = 2;
+  const nsMsgViewTypeValue eShowWatchedThreadsWithUnread = 3;
+  const nsMsgViewTypeValue eShowQuickSearchResults = 4;
+  const nsMsgViewTypeValue eShowVirtualFolderResults = 5;
+  const nsMsgViewTypeValue eShowSearch = 6;
+};
+
+[scriptable, uuid(64852276-1dd2-11b2-8103-afe12002c053)]
+interface nsMsgViewFlagsType : nsISupports
+{
+  /**
+   * flags for GetViewFlags
+   */
+  const nsMsgViewFlagsTypeValue kNone = 0x0;
+  const nsMsgViewFlagsTypeValue kThreadedDisplay = 0x1;
+  const nsMsgViewFlagsTypeValue kShowIgnored = 0x8;
+  const nsMsgViewFlagsTypeValue kUnreadOnly = 0x10;
+  const nsMsgViewFlagsTypeValue kExpandAll = 0x20;
+  const nsMsgViewFlagsTypeValue kGroupBySort = 0x40;
+};
+
+[scriptable, uuid(b94fc200-3008-420a-85c7-67842f133ef8)]
+interface nsMsgViewSortType : nsISupports
+{
+  const nsMsgViewSortTypeValue byNone = 0x11; /* not sorted */
+  const nsMsgViewSortTypeValue byDate = 0x12;
+  const nsMsgViewSortTypeValue bySubject = 0x13;
+  const nsMsgViewSortTypeValue byAuthor = 0x14;
+  const nsMsgViewSortTypeValue byId = 0x15;
+  const nsMsgViewSortTypeValue byThread = 0x16;
+  const nsMsgViewSortTypeValue byPriority = 0x17;
+  const nsMsgViewSortTypeValue byStatus = 0x18;
+  const nsMsgViewSortTypeValue bySize = 0x19;
+  const nsMsgViewSortTypeValue byFlagged = 0x1a;
+  const nsMsgViewSortTypeValue byUnread = 0x1b;
+  const nsMsgViewSortTypeValue byRecipient = 0x1c;
+  const nsMsgViewSortTypeValue byLocation = 0x1d;
+  const nsMsgViewSortTypeValue byTags = 0x1e;
+  const nsMsgViewSortTypeValue byJunkStatus = 0x1f;
+  const nsMsgViewSortTypeValue byAttachments = 0x20;
+  const nsMsgViewSortTypeValue byAccount = 0x21;
+  const nsMsgViewSortTypeValue byCustom = 0x22;
+  const nsMsgViewSortTypeValue byReceived = 0x23;
+  const nsMsgViewSortTypeValue byCorrespondent = 0x24;
+};
+
+[scriptable, uuid(255d1c1e-fde7-11d4-a5be-0060b0fc04b7)]
+interface nsMsgViewNotificationCode : nsISupports
+{
+  const nsMsgViewNotificationCodeValue none = 0;
+  /* No change; this call is just being used to potentially nest other sets of calls
+     inside it.  The "where" and "num" parameters are unused.
+   */
+  const nsMsgViewNotificationCodeValue insertOrDelete = 1;
+  /* Some lines have been inserted or deleted.
+     The "where" parameter will indicate the first line that has been added or
+     removed; the "num" parameter will indicate how many lines, and will be positive on
+     an insertion and negative on a deletion.
+   */
+  const nsMsgViewNotificationCodeValue changed = 2;
+  /* Some lines have had their contents changed (e.g., messages have been marked read
+    or something.)  "where" indicates the first line with a change; "num" indicates
+    how many changed.
+   */
+  const nsMsgViewNotificationCodeValue all = 4;
+  /* Everything changed.  We're now not displaying anything like what we were; we
+     probably opened a new folder or something. The FE needs to forget anything it ever knew
+     about what was being displayed, and start over.  The "where" and "num" parameters are
+     unused.
+   */
+};
+
+[scriptable, uuid(4ec9248e-0108-11d5-a5be-0060b0fc04b7)]
+interface nsMsgViewCommandCheckState : nsISupports
+{
+  const nsMsgViewCommandCheckStateValue notUsed = 0;
+  const nsMsgViewCommandCheckStateValue checked = 1;
+  const nsMsgViewCommandCheckStateValue unchecked = 2;
+};
+
+[scriptable, uuid(ad36e6cc-0109-11d5-a5be-0060b0fc04b7)]
+interface nsMsgViewCommandType : nsISupports
+{
+  const nsMsgViewCommandTypeValue markMessagesRead = 0;
+  const nsMsgViewCommandTypeValue markMessagesUnread = 1;
+  const nsMsgViewCommandTypeValue toggleMessageRead = 2;
+
+  const nsMsgViewCommandTypeValue flagMessages = 3;
+  const nsMsgViewCommandTypeValue unflagMessages = 4;
+
+  const nsMsgViewCommandTypeValue toggleThreadWatched = 6;
+
+  const nsMsgViewCommandTypeValue deleteMsg = 7;
+  const nsMsgViewCommandTypeValue deleteNoTrash = 8;
+  const nsMsgViewCommandTypeValue markThreadRead = 9;
+  const nsMsgViewCommandTypeValue markAllRead = 10;
+  const nsMsgViewCommandTypeValue expandAll = 11;
+  const nsMsgViewCommandTypeValue collapseAll = 12;
+
+  const nsMsgViewCommandTypeValue copyMessages = 13;
+  const nsMsgViewCommandTypeValue moveMessages = 14;
+
+  const nsMsgViewCommandTypeValue selectAll = 15;
+  const nsMsgViewCommandTypeValue downloadSelectedForOffline = 16;
+  const nsMsgViewCommandTypeValue downloadFlaggedForOffline = 17;
+
+  const nsMsgViewCommandTypeValue selectThread = 18;
+  const nsMsgViewCommandTypeValue selectFlagged = 19;
+  const nsMsgViewCommandTypeValue cmdRequiringMsgBody = 20;
+  const nsMsgViewCommandTypeValue label0 = 21;
+  const nsMsgViewCommandTypeValue label1 = 22;
+  const nsMsgViewCommandTypeValue label2 = 23;
+  const nsMsgViewCommandTypeValue label3 = 24;
+  const nsMsgViewCommandTypeValue label4 = 25;
+  const nsMsgViewCommandTypeValue label5 = 26;
+  const nsMsgViewCommandTypeValue lastLabel = 26;
+
+  const nsMsgViewCommandTypeValue junk = 27;
+  const nsMsgViewCommandTypeValue unjunk = 28;
+  const nsMsgViewCommandTypeValue undeleteMsg = 29;
+
+  const nsMsgViewCommandTypeValue applyFilters = 30;
+  const nsMsgViewCommandTypeValue runJunkControls = 31;
+  const nsMsgViewCommandTypeValue deleteJunk = 32;
+};
+
+[scriptable, uuid(65903eb2-1dd2-11b2-ac45-c5b69c1618d7)]
+interface nsMsgNavigationType : nsISupports
+{
+  const nsMsgNavigationTypeValue firstMessage = 1;
+  const nsMsgNavigationTypeValue nextMessage = 2;
+  const nsMsgNavigationTypeValue previousMessage = 3;
+  const nsMsgNavigationTypeValue lastMessage = 4;
+  /**
+   * must match nsMsgViewCommandTypeValue toggleThreadKilled
+   */
+  const nsMsgNavigationTypeValue toggleThreadKilled = 5;
+  const nsMsgNavigationTypeValue firstUnreadMessage = 6;
+  const nsMsgNavigationTypeValue nextUnreadMessage = 7;
+  const nsMsgNavigationTypeValue previousUnreadMessage = 8;
+  const nsMsgNavigationTypeValue lastUnreadMessage = 9;
+  const nsMsgNavigationTypeValue nextUnreadThread = 10;
+  const nsMsgNavigationTypeValue nextUnreadFolder = 11;
+  const nsMsgNavigationTypeValue nextFolder = 12;
+  const nsMsgNavigationTypeValue readMore = 13;
+  /**
+   * Go back to the previous visited message
+   */
+  const nsMsgNavigationTypeValue back = 15;
+  /**
+   * Go forward to the previous visited message
+   */
+  const nsMsgNavigationTypeValue forward = 16;
+  const nsMsgNavigationTypeValue firstFlagged = 17;
+  const nsMsgNavigationTypeValue nextFlagged = 18;
+  const nsMsgNavigationTypeValue previousFlagged = 19;
+  const nsMsgNavigationTypeValue firstNew = 20;
+  const nsMsgNavigationTypeValue editUndo = 21;
+  const nsMsgNavigationTypeValue editRedo = 22;
+  const nsMsgNavigationTypeValue toggleSubthreadKilled = 23;
+};
+
+/*
+ * The contract ID for this component is @mozilla.org/msgDBView/msgDBViewService;1.
+ */
+[scriptable, uuid(bcf6afbe-7d4f-11ec-9092-eb4fed0a5aaa)]
+interface nsIMsgDBViewService : nsISupports
+{
+  /**
+   * JS-callable service to initialize static variables in nsMsgDBView.cpp
+   * upon initialization or when locale changes.
+   */
+  void initializeDBViewStrings();
+};
+
+[scriptable, uuid(fe8a2326-4dd0-11e5-8b8a-206a8aa7a25c)]
+interface nsIMsgDBView : nsISupports
+{
+  /** A shim of XULTreeElement, with only the methods called by nsMsgDBView. */
+  void setJSTree(in nsIMsgJSTree tree);
+
+  void open(in nsIMsgFolder folder, in nsMsgViewSortTypeValue sortType, in nsMsgViewSortOrderValue sortOrder, in nsMsgViewFlagsTypeValue viewFlags, out long count);
+  void openWithHdrs(in nsIMsgEnumerator aHeaders, in nsMsgViewSortTypeValue aSortType,
+                      in nsMsgViewSortOrderValue aSortOrder,
+                      in nsMsgViewFlagsTypeValue aViewFlags, out long aCount);
+  void close();
+
+  void init(in nsIMessenger aMessengerInstance, in nsIMsgWindow aMsgWindow, in nsIMsgDBViewCommandUpdater aCommandUpdater);
+
+  void sort(in nsMsgViewSortTypeValue sortType, in nsMsgViewSortOrderValue sortOrder);
+
+  void doCommand(in nsMsgViewCommandTypeValue command);
+  void doCommandWithFolder(in nsMsgViewCommandTypeValue command, in nsIMsgFolder destFolder);
+  void getCommandStatus(in nsMsgViewCommandTypeValue command, out boolean selectable_p,
+                        out nsMsgViewCommandCheckStateValue selected_p);
+  void applyCommandToIndices(in nsMsgViewCommandTypeValue command,
+                             in Array<nsMsgViewIndex> selection);
+
+  readonly attribute nsMsgViewTypeValue viewType;
+  attribute nsMsgViewFlagsTypeValue viewFlags;
+  /** Assigning to this value does not induce a sort; use the sort() method! */
+  attribute nsMsgViewSortTypeValue sortType;
+  readonly attribute nsMsgViewSortOrderValue sortOrder;
+  /**
+   * Reflects the current secondary sort when a secondary sort is in effect.
+   *  If the primary sort is by date or id, the value of this attribute is moot.
+   * Assigning to this value does not induce a sort; use the sort() method once
+   *  to set your secondary sort, then use it again to set your primary sort.
+   *  The only conceivable reason to write to this value is if you have a
+   *  grouped view where you want to affect the sort order of the (secondary)
+   *  date sort.  (Secondary sort is always by date for grouped views.)
+   */
+  attribute nsMsgViewSortTypeValue secondarySortType;
+  /**
+   * Reflects the current secondary sort order.
+   * Assigning to this value does not induce a sort; use the sort() method for
+   *  all primary and secondary sort needs.  The only reason to assign to this
+   *  value is to affect the secondary sort of a grouped view.
+   */
+  attribute nsMsgViewSortOrderValue secondarySortOrder;
+  readonly attribute nsMsgKey keyForFirstSelectedMessage;
+  readonly attribute nsMsgViewIndex viewIndexForFirstSelectedMsg;
+  /**
+   * this method will automatically expand the destination thread,
+   * if needs be.
+   */
+  void viewNavigate(in nsMsgNavigationTypeValue motion, out nsMsgKey resultId, out nsMsgViewIndex resultIndex, out nsMsgViewIndex threadIndex, in boolean wrap);
+
+  readonly attribute nsIMsgFolder msgFolder;
+  attribute nsIMsgFolder viewFolder; // in the case of virtual folders, the VF db.
+
+  nsMsgKey getKeyAt(in nsMsgViewIndex index);
+
+  /**
+   * Get the view flags at the passed in index.
+   *
+   * @param aIndex - index to get the view flags for
+   *
+   * @ return - 32 bit view flags (e.g., elided)
+   */
+  unsigned long getFlagsAt(in nsMsgViewIndex aIndex);
+
+  /**
+   * Get the msg hdr at the passed in index
+   *
+   * @param aIndex - index to get the msg hdr at.
+   *
+   * @return - msg hdr at the passed in index
+   * @exception - NS_MSG_INVALID_DBVIEW_INDEX
+   */
+  nsIMsgDBHdr getMsgHdrAt(in nsMsgViewIndex aIndex);
+
+  nsIMsgFolder getFolderForViewIndex(in nsMsgViewIndex index); // mainly for search
+  AUTF8String getURIForViewIndex(in nsMsgViewIndex index);
+  nsIMsgDBView cloneDBView(in nsIMessenger aMessengerInstance, in nsIMsgWindow aMsgWindow, in nsIMsgDBViewCommandUpdater aCommandUpdater);
+
+  /**
+   * Provides a list of the message headers for the currently selected messages.
+   *  If the "mail.operate_on_msgs_in_collapsed_threads" preference is enabled,
+   *  then any collapsed thread roots that are selected will also (conceptually)
+   *  have all of the messages in that thread selected and they will be included
+   *  in the returned list. The one exception to this is if the front end fails
+   *  to summarize the selection, and we fall back to just displaying a single
+   *  message. In that case, we won't include the children of the collapsed
+   *  thread. However, the numSelected attribute will count those children,
+   *  because the summarizeSelection code uses that to know that it should
+   *  try to summarize the selection.
+   *
+   * If the user has right-clicked on a message, this will return that message
+   *  (and any collapsed children if so enabled) and not the selection prior to
+   *  the right-click.
+   *
+   * @return an array containing the selected message headers.  You are free to
+   *     mutate the array; it will not affect the underlying selection.
+   */
+  Array<nsIMsgDBHdr> getSelectedMsgHdrs();
+
+  Array<AUTF8String> getURIsForSelection();
+  Array<nsMsgViewIndex> getIndicesForSelection();
+
+  readonly attribute AUTF8String URIForFirstSelectedMessage;
+  readonly attribute nsIMsgDBHdr hdrForFirstSelectedMessage;
+
+  /**
+   * The number of selected messages.  If the
+   *  "mail.operate_on_msgs_in_collapsed_threads" preference is enabled, then
+   *  any collapsed thread roots that are selected will also conceptually have
+   *  all of the messages in that thread selected.
+   */
+  readonly attribute unsigned long numSelected;
+  readonly attribute nsMsgViewIndex msgToSelectAfterDelete;
+  readonly attribute nsMsgViewIndex currentlyDisplayedMessage;
+
+  /**
+   * Number of messages in view, including messages in collapsed threads.
+   * Not currently implemented for threads with unread or watched threads
+   * with unread.
+   */
+  readonly attribute long numMsgsInView;
+  // used by "go to folder" feature
+  // and "remember last selected message" feature
+  // if key is not found, we don't select.
+  void selectMsgByKey(in nsMsgKey key);
+
+  void selectFolderMsgByKey(in nsIMsgFolder aFolder, in nsMsgKey aKey);
+  // we'll suppress displaying messages if the message pane is collapsed
+  attribute boolean suppressMsgDisplay;
+
+  // we'll suppress command updating during folder loading
+  attribute boolean suppressCommandUpdating;
+
+  /**
+   * Suppress change notifications. This is faster than Begin/EndUpdateBatch
+   * on the tree, but less safe in that you're responsible for row invalidation
+   * and row count changes.
+   */
+  attribute boolean suppressChangeNotifications;
+
+  //to notify tree that rows are going away
+  void onDeleteCompleted(in boolean succeeded);
+
+  readonly attribute nsIMsgDatabase db;
+
+  readonly attribute boolean supportsThreading;
+
+  attribute nsIMsgSearchSession searchSession;
+  readonly attribute boolean removeRowOnMoveOrDelete;
+
+  /**
+   * Finds the view index of the passed in msgKey. Note this should not
+   * be called on cross-folder views since the msgKey may not be unique.
+   *
+   * @param aMsgKey - key to find.
+   * @param aExpand - whether to expand a collapsed thread to find the key.
+   *
+   * @return        - view index of msg hdr, -1 if hdr not found.
+   */
+  nsMsgViewIndex findIndexFromKey(in nsMsgKey aMsgKey, in boolean aExpand);
+  /**
+   * Finds the view index of the passed in msgHdr.
+   *
+   * @param aMsgHdr - hdr to find.
+   * @param aExpand - whether to expand a collapsed thread to find the hdr.
+   *
+   * @return        - view index of msg hdr, -1 if hdr not found.
+   */
+  nsMsgViewIndex findIndexOfMsgHdr(in nsIMsgDBHdr aMsgHdr, in boolean aExpand);
+
+  /**
+   * Expands a thread and selects all it's member messages.
+   *
+   * @param aIndex   - View index of a message in the thread to expand (can be
+                       any message which is a member of the thread).
+   * @param aAugment - If true, Augment the existing selection.
+   *                   If false, replace it.
+   */
+  void ExpandAndSelectThreadByIndex(in nsMsgViewIndex aIndex, in boolean aAugment);
+
+  /**
+   * This method returns the nsIMsgThread object containing the header displayed
+   * at the desired row. For grouped views and cross folder saved searches,
+   * this will be the view thread, not the db thread.
+   *
+   * @param aIndex   view index we want corresponding thread object of.
+   *
+   * @return         the thread object at the requested view index
+   */
+  nsIMsgThread getThreadContainingIndex(in nsMsgViewIndex aIndex);
+
+  /**
+   * Insert rows into the view. The caller should use NoteChange() below to
+   * update the view.
+   *
+   * @param aIndex   view index for insertion start.
+   * @param aNumRows number of rows to insert.
+   * @param aKey     msgKey.
+   * @param aFlags   msgFlags.
+   * @param aLevel   treeview indent level.
+   * @param aFolder  nsIMsgFolder, required for search/xfvf views.
+   */
+  void insertTreeRows(in nsMsgViewIndex aIndex, in unsigned long aNumRows,
+                      in nsMsgKey aKey, in nsMsgViewFlagsTypeValue aFlags,
+                      in unsigned long aLevel, in nsIMsgFolder aFolder);
+
+  /**
+   * Remove rows from the view.  The caller should use NoteChange() below to
+   * update the view.
+   *
+   * @param aIndex   view index for removal start.
+   * @param aNumRows number of rows to remove.
+   */
+  void removeTreeRows(in nsMsgViewIndex aIndex, in unsigned long aNumRows);
+
+  /**
+   * Notify tree that rows have changed.
+   *
+   * @param aFirstLineChanged   first view index for changed rows.
+   * @param aNumRows            number of rows changed; < 0 means removed.
+   * @param aChangeType         changeType.
+   */
+  void NoteChange(in nsMsgViewIndex aFirstLineChanged, in long aNumRows,
+                  in nsMsgViewNotificationCodeValue aChangeType);
+
+  /**
+   * Return the view thread corresponding to aMsgHdr. If we're a cross-folder
+   * view, then it would be the cross folder view thread, otherwise, the
+   * db thread object.
+   *
+   * @param aMsgHdr message header we want the view thread object of.
+   *
+   * @return        view thread object for msg hdr.
+   */
+  nsIMsgThread getThreadContainingMsgHdr(in nsIMsgDBHdr aMsgHdr);
+
+  // use lines or kB for size?
+  readonly attribute boolean usingLines;
+
+  // Custom Column Implementation note: see nsIMsgCustomColumnHandler
+
+  // attaches a custom column handler to a specific column (can be a new column or a built in)
+  void addColumnHandler(in AString aColumn, in nsIMsgCustomColumnHandler aHandler);
+
+  // removes a custom column handler leaving the column to be handled by the system
+  void removeColumnHandler(in AString aColumn);
+
+  // returns the custom column handler attached to a specific column - if any
+  nsIMsgCustomColumnHandler getColumnHandler(in AString aColumn);
+
+  /**
+   * The custom column to use for sorting purposes (when sort type is
+   *  nsMsgViewSortType.byCustom.)
+   */
+  attribute AString curCustomColumn;
+
+  /**
+   * The custom column used for a secondary sort, blank if secondarySort is
+   * not byCustom. The secondary sort design is such that the desired secondary
+   * is sorted first, followed by sort by desired primary. The secondary is
+   * read only, as it is set internally according to this design.
+   */
+  readonly attribute AString secondaryCustomColumn;
+  /**
+   * Scriptable accessor for the cell text for a column
+   *
+   * @param aRow - row we want cell text for
+   * @param aColumnName - name of column we want cell text for
+   *
+   * @returns The cell text for the given row and column, if any.
+   * @notes This does not work for custom columns yet.
+   */
+  AString cellTextForColumn(in long aRow, in AString aColumnName);
+
+  /**
+   * Get all of the data needed to display a row. Effectively a combination of
+   * CellTextForColumn, GetRowProperties and GetLevel, for performance reasons.
+   *
+   * @param aRow - Index of the row we want data for.
+   * @param aColumnNames - The column names we want cell text for.
+   * @param aProperties - The properties of the row.
+   * @param aThreadLevel - The thread level of the row.
+   *
+   * @returns The cell text for the columns in `aColumnNames`.
+   */
+  Array<AString> cellDataForColumns(in long aRow,
+                                    in Array<AString> aColumnNames,
+                                    out AString aProperties,
+                                    out long aThreadLevel);
+};
+
+/* this interface is rapidly morphing from a command updater interface into a more generic
+   FE updater interface to handle changes in the view
+*/
+
+[scriptable, uuid(ce8f52ee-e742-4b31-8bdd-2b3a8168a117)]
+interface nsIMsgDBViewCommandUpdater : nsISupports
+{
+  /* Eventually we'll flush this out into some kind of rich interface
+  which may take specific selection changed type notifications like
+  no selections, single selection, multi-selection, etc. For starters,
+  we are going to keep it generic. The back end will only push an update
+  command status when the # of selected items changes.
+  */
+
+  void updateCommandStatus();
+
+  /* displayed message has changed */
+  void displayMessageChanged(in nsIMsgFolder aFolder, in AString aSubject, in ACString aKeywords);
+
+  /**
+  * allows the backend to tell the front end to re-determine
+  * which message we should selet after a delete or move
+  */
+  void updateNextMessageAfterDelete();
+
+  /**
+  * tell the front end that the selection has changed, and may need to be
+  * resummarized.
+  *
+  * @return   true if we did summarize, false otherwise.
+  */
+  boolean summarizeSelection();
+
+  /**
+   * Tell the front end that the selected message was removed and it should update.
+   */
+  void selectedMessageRemoved();
+};
+
+/**
+ * A shim of XULTreeElement, with only the methods called by nsMsgDBView.
+ */
+[scriptable, uuid(c5f6b1a2-f56a-49cb-b863-badf158206d5)]
+interface nsIMsgJSTree : nsISupports
+{
+  void beginUpdateBatch();
+  void endUpdateBatch();
+  void ensureRowIsVisible(in long index);
+  void invalidate();
+  void invalidateRange(in long startIndex, in long endIndex);
+  void rowCountChanged(in long index, in long count);
+  attribute long currentIndex;
+};
diff --git a/comm/mailnews/base/public/nsIMsgEnumerator.idl b/comm/mailnews/base/public/nsIMsgEnumerator.idl
new file mode 100644
index 0000000000..9ce2523a88
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgEnumerator.idl
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgDBHdr;
+interface nsIMsgThread;
+
+/**
+ * nsIJSIterator implements the JavaScript iterator protocol.
+ * For details on the JS side, see:
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterator_protocol
+ */
+[scriptable, uuid(4406175e-1aa4-414c-ad7c-86bd76e102f8)]
+interface nsIJSIterator : nsISupports {
+  /**
+   * @returns {{value: Object, done: Boolean}} the iteration state.
+   * 'value' holds the next item, and 'done' flags the end of the iteration.
+   * (notionally, both 'value' and 'done' are always present, but a missing
+   * 'done' is considered to be false, and 'value' should be ignored if
+   * 'done' is true, according to the protocol).
+   */
+  [implicit_jscontext]
+  jsval next();
+};
+
+
+/**
+ * nsIMsgEnumerator is an object for iterating forward over an ordered set of
+ * messages (nsIMsgHdrs). There is no provision to reset the iteration.
+ */
+[scriptable, uuid(5760cb6d-1a71-485f-ad85-5a98a9da2104)]
+interface nsIMsgEnumerator : nsISupports {
+  /**
+   * Implements the JavaScript iterable protocol, which allows
+   * for...of constructs and the like.
+   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_protocol
+   * NOTE: the nsIMsgEnumerator is "used up" by iterator(), just as it is by
+   * getNext()/hasMoreElements(). So you can only loop over the enumerator once.
+   */
+  [symbol]
+  nsIJSIterator iterator();
+
+  /**
+   * Called to determine whether or not there are any messages remaining
+   * to be retrieved from the enumerator.
+   *
+   * @returns true if getNext() may be called to fetch a message, or
+   *          false if there are no more messages.
+   */
+  boolean hasMoreElements();
+
+  /**
+   * Called to retrieve the next message in the set.
+   *
+   * @returns the next element in the enumeration.
+   */
+  nsIMsgDBHdr getNext();
+};
+
+/**
+ * nsIMsgThreadEnumerator is an object for iterating forward over an ordered set of
+ * message threads (nsIMsgThread). There is no provision to reset the iteration.
+ */
+[scriptable, uuid(e39ae1a8-2b94-4f2b-abb4-250171047501)]
+interface nsIMsgThreadEnumerator : nsISupports {
+  /**
+   * Implements the JavaScript iterable protocol, which allows
+   * for...of constructs and the like.
+   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_protocol
+   * NOTE: the nsIMsgThreadEnumerator is "used up" by iterator(), just as it is by
+   * getNext()/hasMoreElements(). So you can only loop over the enumerator once.
+   */
+  [symbol]
+  nsIJSIterator iterator();
+
+  /**
+   * Called to determine whether or not there are any messages remaining
+   * to be retrieved from the enumerator.
+   *
+   * @returns true if getNext() may be called to fetch a message, or
+   *          false if there are no more messages.
+   */
+  boolean hasMoreElements();
+
+  /**
+   * Called to retrieve the next thread in the set.
+   *
+   * @returns the next element in the enumeration.
+   */
+  nsIMsgThread getNext();
+};
diff --git a/comm/mailnews/base/public/nsIMsgFolder.idl b/comm/mailnews/base/public/nsIMsgFolder.idl
new file mode 100644
index 0000000000..4f0edb8818
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgFolder.idl
@@ -0,0 +1,877 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIFolderListener.idl"
+#include "nsIMsgIncomingServer.idl"
+#include "nsIMsgCopyServiceListener.idl"
+#include "nsIUrlListener.idl"
+#include "nsIMsgEnumerator.idl"
+
+interface nsIMsgDBHdr;
+interface nsIMsgWindow;
+interface nsIMsgDatabase;
+interface nsIDBFolderInfo;
+interface nsIMsgFilterList;
+interface nsIFile;
+interface nsIOutputStream;
+interface nsIInputStream;
+interface nsIFile;
+interface nsIMsgIdentity;
+interface nsIMsgThread;
+interface nsIMsgPluggableStore;
+
+typedef long nsMsgBiffState;
+
+// enumerated type for determining if a message has been replied to, forwarded, etc.
+typedef long nsMsgDispositionState;
+
+/*
+ * The contract ID for this component is @mozilla.org/msgFolder/msgFolderService;1.
+ */
+[scriptable, uuid(5639c204-48ac-4115-897f-3b16821fe118)]
+interface nsIMsgFolderService : nsISupports
+{
+  /**
+   * JS-callable service to initialize static variables in nsMsgDBFolder.cpp
+   * upon initialization or when locale changes.
+   */
+  void initializeFolderStrings();
+};
+
+[scriptable, uuid(5d253ba2-42aa-43a7-b584-0059855ababf)]
+interface nsIMsgFolder : nsISupports {
+
+  const nsMsgBiffState nsMsgBiffState_NewMail = 0; // User has new mail waiting.
+  const nsMsgBiffState nsMsgBiffState_NoMail =  1; // No new mail is waiting.
+  const nsMsgBiffState nsMsgBiffState_Unknown = 2; // We dunno whether there is new mail.
+
+  /* folder name properties */
+  readonly attribute AUTF8String URI;
+  attribute AString name;
+  attribute AString prettyName;
+  readonly attribute AString abbreviatedName;
+
+  /**
+   * Set pretty name again from original name,
+   * typically used when locale changes.
+   */
+  void setPrettyNameFromOriginal();
+
+  attribute nsIMsgFolder parent;
+
+  /// Returns an enumerator containing the messages within the current database.
+  readonly attribute nsIMsgEnumerator messages;
+
+  /**
+   * This method is called by the folder-lookup-service after constructing
+   * a folder to initialize its URI. You would not normally
+   * call this method directly.
+   *
+   * @param uri - The URI of the folder.
+   */
+  void Init(in AUTF8String uri);
+
+  void startFolderLoading();
+  void endFolderLoading();
+
+  void folderNamesReady(out boolean aReady);
+
+  /* get new headers for db */
+  void updateFolder(in nsIMsgWindow aWindow);
+
+  /**
+   * URL for this folder
+   */
+  readonly attribute AUTF8String folderURL;
+
+  /**
+   * should probably move to the server
+   */
+  readonly attribute boolean showDeletedMessages;
+
+  /**
+   * this folder's parent server
+   */
+  readonly attribute nsIMsgIncomingServer server;
+
+  /**
+   * is this folder the "phantom" server folder?
+   */
+  readonly attribute boolean isServer;
+  readonly attribute boolean canSubscribe;
+  readonly attribute boolean canFileMessages;
+  readonly attribute boolean noSelect;  // this is an imap no select folder
+  readonly attribute boolean imapShared; // this is an imap shared folder
+  readonly attribute boolean canDeleteMessages; // can't delete from imap read-only
+
+  /**
+   * does this folder allow subfolders?
+   * for example, newsgroups cannot have subfolders, and the INBOX
+   * on some IMAP servers cannot have subfolders
+   */
+  readonly attribute boolean canCreateSubfolders;
+
+  /**
+   * can you change the name of this folder?
+   * for example, newsgroups
+   * and some special folders can't be renamed
+   */
+  readonly attribute boolean canRename;
+
+  readonly attribute boolean canCompact;
+
+  /**
+   * the phantom server folder
+   */
+  readonly attribute nsIMsgFolder rootFolder;
+
+  /**
+   * Get the server's list of filters. (Or in the case of news, the
+   * filter list for this newsgroup)
+   * This list SHOULD be used for all incoming messages.
+   *
+   * Since the returned nsIMsgFilterList is mutable, it is not necessary to call
+   * setFilterList after the filters have been changed.
+   *
+   * @param aMsgWindow  @ref msgwindow "The standard message window"
+   * @return            The list of filters
+   */
+  nsIMsgFilterList getFilterList(in nsIMsgWindow msgWindow);
+
+  /**
+   * Set the server's list of filters.
+   *
+   * Note that this does not persist the filter list. To change the contents
+   * of the existing filters, use getFilterList and mutate the values as
+   * appropriate.
+   *
+   * @param aFilterList The new list of filters.
+   */
+  void setFilterList(in nsIMsgFilterList filterList);
+
+  /**
+   * Get user editable filter list. This does not have to be the same as
+   * the filterlist above, typically depending on the users preferences.
+   * The filters in this list are not processed, but only to be edited by
+   * the user.
+   * @see getFilterList
+   *
+   * @param aMsgWindow  @ref msgwindow "The standard message window"
+   * @return            The list of filters
+   */
+  nsIMsgFilterList getEditableFilterList(in nsIMsgWindow aMsgWindow);
+
+  /**
+   * Set user editable filter list.
+   * This does not persist the filterlist, @see setFilterList
+   * @see getEditableFilterList
+   * @see setFilterList
+   *
+   * @param aFilterList The new list of filters.
+   */
+  void setEditableFilterList(in nsIMsgFilterList aFilterList);
+
+  /**
+   * Force close the mail database associated with this folder.
+   */
+  void ForceDBClosed();
+  /**
+   * Close and backup a folder database prior to reparsing
+   *
+   * @param  newName  New name of the corresponding message folder.
+   *                  Used in rename to set the file name to match the renamed
+   *                  folder. Set to empty to use the existing folder name.
+   */
+  void closeAndBackupFolderDB(in ACString newName);
+
+  /**
+   * Delete the backing store of the folder, but not the folder itself.
+   */
+  [noscript]
+  void deleteStorage();
+
+  /**
+   * Delete this folder and its children, if any.
+   * Note: this may mean moving it to trash and/or requesting confirmation
+   * from the user, depending on implementation.
+   * So the deletion may not take place immediately (or at all!)
+   *
+   * @param msgWindow  msgWindow to display status feedback in
+   */
+  void deleteSelf(in nsIMsgWindow msgWindow);
+
+  /**
+   * Delete the given subfolder of this folder.
+   * It does not need to be a direct child.
+   *
+   * @param folder         a child subfolder to delete
+   * @param deleteStorage  whether to also delete the folder storage on disk
+   */
+  void propagateDelete(in nsIMsgFolder folder, in boolean deleteStorage);
+
+  /**
+   * Delete the folder and all of its subfolders.
+   *
+   * @param deleteStorage  whether to also delete the folder storage on disk
+   */
+  [noscript]
+  void recursiveDelete(in boolean deleteStorage);
+
+  /**
+   * Create a subfolder of the current folder with the passed in name.
+   * For IMAP, this will be an async operation and the folder won't exist
+   * until it is created on the server.
+   *
+   * @param folderName name of the folder to create.
+   * @param msgWindow msgWindow to display status feedback in.
+   *
+   * @exception NS_MSG_FOLDER_EXISTS
+   */
+  void createSubfolder(in AString folderName, in nsIMsgWindow msgWindow);
+
+  /**
+   * Adds the subfolder with the passed name to the folder hierarchy.
+   * This is used internally during folder discovery; It shouldn't be
+   * used to create folders since it won't create storage for the folder,
+   * especially for imap. Unless you know exactly what you're doing, you
+   * should be using createSubfolder + getChildNamed or createLocalSubfolder.
+   *
+   * @param aFolderName Name of the folder to add.
+   * @returns The folder added.
+   */
+  nsIMsgFolder addSubfolder(in AString aFolderName);
+
+  /* this method ensures the storage for the folder exists.
+    For local folders, it creates the berkeley mailbox if missing.
+    For imap folders, it subscribes to the folder if it exists,
+    or creates it if it doesn't exist
+  */
+  void createStorageIfMissing(in nsIUrlListener urlListener);
+
+  /**
+   * Compact this folder (Expunge _and_ compact, for IMAP folders).
+   *
+   * @param aListener   Notified upon completion, can be null.
+   *                    OnStartRunningUrl() will not be called.
+   *                    OnStopRunningUrl() will be called upon completion,
+   *                    with a null URL.
+   * @param aMsgWindow  For progress/status, can be null.
+   */
+  void compact(in nsIUrlListener aListener, in nsIMsgWindow aMsgWindow);
+  /**
+   * Compact all folders in the account corresponding to this folder.
+   *
+   * @param aListener   Notified upon completion, can be null.
+   *                    OnStartRunningUrl() will not be called.
+   *                    OnStopRunningUrl() will be called upon completion,
+   *                    with a null URL.
+   * @param aMsgWindow  For progress/status, can be null.
+   */
+  void compactAll(in nsIUrlListener aListener, in nsIMsgWindow aMsgWindow);
+
+  void emptyTrash(in nsIUrlListener aListener);
+
+  /**
+   * change the name of the folder
+   *
+   * @param name the new name of the folder
+   */
+  void rename(in AString name, in nsIMsgWindow msgWindow);
+  void renameSubFolders( in nsIMsgWindow msgWindow, in nsIMsgFolder oldFolder);
+
+  AString generateUniqueSubfolderName(in AString prefix,
+                                      in nsIMsgFolder otherFolder);
+
+  void updateSummaryTotals(in boolean force);
+  void summaryChanged();
+  /**
+   * get the total number of unread messages in this folder,
+   * or in all subfolders
+   *
+   * @param deep if true, descends into all subfolders and gets a grand total
+   */
+  long getNumUnread(in boolean deep);
+
+  /**
+   * get the total number of messages in this folder,
+   * or in all subfolders
+   *
+   * @param deep if true, descends into all subfolders and gets a grand total
+   */
+  long getTotalMessages(in boolean deep);
+
+  /**
+   * These functions are used for tricking the front end into thinking that we
+   * have more messages than are really in the DB.  This is usually after an
+   * IMAP message copy where we don't want to do an expensive select until the
+   * user actually opens that folder. These functions are called when
+   * MSG_Master::GetFolderLineById is populating a MSG_FolderLine struct used
+   * by the FE.
+   */
+  readonly attribute long numPendingUnread;
+  readonly attribute long numPendingTotalMessages;
+  void changeNumPendingUnread(in long delta);
+  void changeNumPendingTotalMessages(in long delta);
+
+ /**
+  * does this folder have new messages
+  *
+  */
+  attribute boolean hasNewMessages;
+
+  /**
+   * Indicates whether this folder or any of its subfolders have new messages.
+   */
+  readonly attribute boolean hasFolderOrSubfolderNewMessages;
+
+  /**
+   * return the first new message in the folder
+   *
+   */
+  readonly attribute nsIMsgDBHdr firstNewMessage;
+
+  /**
+   * clear new status flag of all of the new messages
+   */
+  void clearNewMessages();
+
+  readonly attribute long long expungedBytes;
+
+  /**
+   * Can this folder be deleted?
+   * For example, special folders and isServer folders cannot be deleted.
+   */
+  readonly attribute boolean deletable;
+
+  /**
+   * should we be displaying recipients instead of the sender?
+   * for example, in the Sent folder, recipients are more relevant
+   * than the sender
+   */
+  readonly attribute boolean displayRecipients;
+
+  /**
+   * used to determine if it will take a long time to download all
+   * the headers in this folder - so that we can do folder notifications
+   * synchronously instead of asynchronously
+   */
+  readonly attribute boolean manyHeadersToDownload;
+
+  readonly attribute ACString relativePathName;
+
+  /**
+   * size of this folder on disk (not including .msf file)
+   * for imap, it's the sum of the size of the messages
+   */
+  attribute long long sizeOnDisk;
+
+  readonly attribute ACString username;
+  readonly attribute ACString hostname;
+
+  /**
+   * Sets a flag on the folder. The known flags are defined in
+   * nsMsgFolderFlags.h.
+   *
+   * @param flag  The flag to set on the folder.
+   */
+  void setFlag(in unsigned long flag);
+
+  /**
+   * Clears a flag on the folder. The known flags are defined in
+   * nsMsgFolderFlags.h.
+   *
+   * @param flag  The flag to clear on the folder.
+   */
+  void clearFlag(in unsigned long flag);
+
+  /**
+   * Determines if a flag is set on the folder or not. The known flags are
+   * defined in nsMsgFolderFlags.h.
+   *
+   * @param flag  The flag to check on the folder.
+   * @return      True if the flag exists.
+   */
+  boolean getFlag(in unsigned long flag);
+
+  /**
+   * Toggles a flag on the folder. The known flags are defined in
+   * nsMsgFolderFlags.h.
+   *
+   * @param flag  The flag to toggle
+   */
+  void toggleFlag(in unsigned long flag);
+
+  /**
+   * Called to notify the database and/or listeners of a change of flag. The
+   * known flags are defined in nsMsgFolderFlags.h
+   *
+   * @note        This doesn't need to be called for normal flag changes via
+   *              the *Flag functions on this interface.
+   *
+   * @param flag  The flag that was changed.
+   */
+  void onFlagChange(in unsigned long flag);
+
+  /**
+   * Direct access to the set/get all the flags at once.
+   */
+  attribute unsigned long flags;
+
+  /**
+   * Gets the first folder that has the specified flags set.
+   *
+   * @param flags    The flag(s) to check for.
+   * @return         The folder or the first available child folder that has
+   *                 the specified flags set, or null if there are none.
+   */
+  nsIMsgFolder getFolderWithFlags(in unsigned long flags);
+
+  /**
+   * Gets the folders that have the specified flag set.
+   *
+   * @param flags    The flag(s) to check for.
+   * @return         An array of folders that have the specified flags set.
+   *                 The array may have zero elements.
+   */
+  Array<nsIMsgFolder> getFoldersWithFlags(in unsigned long flags);
+
+  /**
+   * Check if this folder (or one of its ancestors) is special.
+   *
+   * @param flags          The "special" flags to check.
+   * @param checkAncestors Should ancestors be checked too.
+   */
+  boolean isSpecialFolder(in unsigned long flags,
+                          [optional] in boolean checkAncestors);
+
+  AUTF8String getUriForMsg(in nsIMsgDBHdr msgHdr);
+
+  /**
+   * Deletes the messages from the folder.
+   *
+   * @param messages      The array of nsIMsgDBHdr objects to be deleted.
+   * @param msgWindow     The standard message window object, for alerts et al.
+   * @param deleteStorage Whether or not the message should be truly deleted, as
+                          opposed to moving to trash.
+   * @param isMove        Whether or not this is a deletion for moving messages.
+   * @param allowUndo     Whether this action should be undoable.
+   */
+  void deleteMessages(in Array<nsIMsgDBHdr> messages,
+                      in nsIMsgWindow msgWindow,
+                      in boolean deleteStorage, in boolean isMove,
+                      in nsIMsgCopyServiceListener listener, in boolean allowUndo);
+
+  void copyMessages(in nsIMsgFolder srcFolder, in Array<nsIMsgDBHdr> messages,
+                    in boolean isMove, in nsIMsgWindow msgWindow,
+                    in nsIMsgCopyServiceListener listener, in boolean isFolder,
+                    in boolean allowUndo);
+
+  void copyFolder(in nsIMsgFolder srcFolder, in boolean isMoveFolder,
+                  in nsIMsgWindow msgWindow, in nsIMsgCopyServiceListener listener);
+
+  void copyFileMessage(in nsIFile file, in nsIMsgDBHdr msgToReplace,
+                       in boolean isDraft, in unsigned long newMsgFlags,
+                       in ACString aKeywords,
+                       in nsIMsgWindow msgWindow,
+                       in nsIMsgCopyServiceListener listener);
+
+  void acquireSemaphore(in nsISupports semHolder);
+  void releaseSemaphore(in nsISupports semHolder);
+  boolean testSemaphore(in nsISupports semHolder);
+  readonly attribute boolean locked;
+
+  void getNewMessages(in nsIMsgWindow aWindow, in nsIUrlListener aListener);
+
+  /**
+   * Write out summary data for this folder to the given folder cache.
+   */
+  void writeToFolderCache(in nsIMsgFolderCache folderCache, in boolean deep);
+
+  attribute unsigned long biffState;
+
+  /**
+   * The number of new messages since this folder's last biff.
+   *
+   * @param deep if true, descends into all subfolders and gets a grand total
+   */
+
+   long getNumNewMessages(in boolean deep);
+
+   void setNumNewMessages(in long numNewMessages);
+
+  /**
+   * are we running a url as a result of the user clicking get msg?
+   */
+  attribute boolean gettingNewMessages;
+
+  /**
+   * local path of this folder
+   */
+  attribute nsIFile filePath;
+
+  /// an nsIFile corresponding to the .msf file.
+  readonly attribute nsIFile summaryFile;
+
+  readonly attribute AUTF8String baseMessageURI;
+  AUTF8String generateMessageURI(in nsMsgKey msgKey);
+
+  const nsMsgDispositionState nsMsgDispositionState_None = -1;
+  const nsMsgDispositionState nsMsgDispositionState_Replied = 0;
+  const nsMsgDispositionState nsMsgDispositionState_Forwarded = 1;
+  const nsMsgDispositionState nsMsgDispositionState_Redirected = 2;
+
+  void addMessageDispositionState(in nsIMsgDBHdr aMessage,
+                                  in nsMsgDispositionState aDispositionFlag);
+
+  void markMessagesRead(in Array<nsIMsgDBHdr> messages, in boolean markRead);
+  void markAllMessagesRead(in nsIMsgWindow aMsgWindow);
+  void markMessagesFlagged(in Array<nsIMsgDBHdr> messages, in boolean markFlagged);
+  void markThreadRead(in nsIMsgThread thread);
+
+  /**
+   * Gets the message database for the folder.
+   *
+   * Note that if the database is out of date, the implementation MAY choose to
+   * throw an error. For a handle to the database which MAY NOT throw an error,
+   * one can use getDBFolderInfoAndDB.
+   *
+   * The attribute can also be set to another database or to null to force the
+   * folder to reopen the same database when it is needed again.
+   *
+   * @exception NS_MSG_ERROR_FOLDER_SUMMARY_MISSING If the database does not
+   *                         exist.
+   * @exception NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE If the database contains
+   *                         out of date information.
+   * @see nsIMsgFolder::getDBFolderInfoAndDB.
+   */
+  attribute nsIMsgDatabase msgDatabase;
+
+  /// Close the database if not open in folder.
+  void closeDBIfFolderNotOpen(in boolean forceClosed);
+
+  /// Does the folder have a local reference to the msgDatabase?
+  readonly attribute boolean databaseOpen;
+
+  /**
+   * Get the backup message database, used in reparsing. This database must
+   * be created first using closeAndBackupFolderDB()
+   *
+   * @return   backup message database
+   */
+  nsIMsgDatabase getBackupMsgDatabase();
+  /**
+   * Remove the backup message database file
+   */
+  void removeBackupMsgDatabase();
+  /**
+   * Open the backup message database file
+   */
+  void openBackupMsgDatabase();
+  nsIMsgDatabase getDBFolderInfoAndDB(out nsIDBFolderInfo folderInfo);
+  nsIMsgDBHdr GetMessageHeader(in nsMsgKey msgKey);
+
+  readonly attribute boolean supportsOffline;
+  boolean shouldStoreMsgOffline(in nsMsgKey msgKey);
+  boolean hasMsgOffline(in nsMsgKey msgKey);
+
+  /**
+   * Get an offline store output stream for the passed message header.
+   *
+   * @param aHdr hdr of message to get outputstream for
+   * @returns An output stream to write to.
+   */
+  nsIOutputStream getOfflineStoreOutputStream(in nsIMsgDBHdr aHdr);
+
+  /**
+   * !!! DEPRECATED (Bug 1733849) !!!
+   * Use getLocalMsgStream() instead.
+   *
+   * Get an input stream for the passed message header. The stream will
+   * be positioned at the start of the message.
+   *
+   * @param aHdr hdr of message to get the input stream for.
+   * @returns an input stream to read the message from
+   */
+  nsIInputStream getMsgInputStream(in nsIMsgDBHdr aHdr);
+
+  /**
+   * Returns an input stream for reading a locally-stored message.
+   * (That means any message in a local folder, or a message marked as
+   * Offline on a non-local folder).
+   * The stream contains the single message.
+   * The returned stream should _not_ be considered seekable.
+   *
+   * @param hdr   The message to get the input stream for.
+   * @returns     Input stream to read the message from.
+   */
+  nsIInputStream getLocalMsgStream(in nsIMsgDBHdr aHdr);
+
+  void downloadMessagesForOffline(in Array<nsIMsgDBHdr> messages,
+                                  in nsIMsgWindow window);
+  nsIMsgFolder getChildWithURI(in AUTF8String uri, in boolean deep,
+                               in boolean caseInsensitive);
+  void downloadAllForOffline(in nsIUrlListener listener, in nsIMsgWindow window);
+  /**
+   *  Turn notifications on/off for various notification types. Currently only
+   *  supporting allMessageCountNotifications which refers to both total and
+   *  unread message counts.
+   */
+  const unsigned long allMessageCountNotifications    = 0;
+  void enableNotifications(in long notificationType, in boolean enable);
+  boolean isCommandEnabled(in ACString command);
+  boolean matchOrChangeFilterDestination(in nsIMsgFolder folder,
+                                         in boolean caseInsensitive);
+  boolean confirmFolderDeletionForFilter(in nsIMsgWindow msgWindow);
+  void alertFilterChanged(in nsIMsgWindow msgWindow);
+  void throwAlertMsg(in string msgName, in nsIMsgWindow msgWindow);
+  AString getStringWithFolderNameFromBundle(in string msgName);
+  void notifyCompactCompleted();
+  /**
+   * Calculate ordering of this folder against another.
+   */
+  long compareSortKeys(in nsIMsgFolder msgFolder);
+
+  attribute nsIMsgRetentionSettings retentionSettings;
+  attribute nsIMsgDownloadSettings downloadSettings;
+  boolean callFilterPlugins(in nsIMsgWindow aMsgWindow);
+  /**
+   * used for order in the folder pane, folder pickers, etc.
+   */
+  attribute long sortOrder;
+
+  attribute nsIDBFolderInfo dBTransferInfo;
+
+  /**
+   * Set a string property on the folder.
+   */
+  void setStringProperty(in string propertyName, in AUTF8String propertyValue);
+
+  /**
+   * Returns the value of a string property.
+   * Throws an error if property does not exist.
+   */
+  AUTF8String getStringProperty(in string propertyName);
+
+  /* does not persist across sessions */
+  attribute nsMsgKey lastMessageLoaded;
+
+  /**
+   * Returns an array containing nsIMsgFolder items that are
+   * subfolders of the instance this is called on.
+   */
+  readonly attribute Array<nsIMsgFolder> subFolders;
+
+  /**
+   * Returns true if this folder has sub folders.
+   */
+  readonly attribute boolean hasSubFolders;
+
+  /**
+   * Returns the number of sub folders that this folder has.
+   */
+  readonly attribute unsigned long numSubFolders;
+
+  /**
+   * Determines if this folder is an ancestor of the supplied folder.
+   *
+   * @param folder  The folder that may or may not be a descendent of this
+   *                folder.
+   */
+  boolean isAncestorOf(in nsIMsgFolder folder);
+
+  /**
+   * Looks in immediate children of this folder for the given name.
+   *
+   * @param name the name of the target subfolder
+   */
+  boolean containsChildNamed(in AString name);
+
+  /**
+   * Return the child folder which the specified name.
+   *
+   * @param aName  The name of the child folder to find
+   * @return       The child folder
+   * @exception NS_ERROR_FAILURE Thrown if the folder with aName does not exist
+   */
+  nsIMsgFolder getChildNamed(in AString aName);
+
+  /**
+   * Finds the sub folder with the specified name.
+   *
+   * @param escapedSubFolderName  The name of the sub folder to find.
+   * @note                        Even if the folder doesn't currently exist,
+   *                              a nsIMsgFolder may be returned.
+   */
+  nsIMsgFolder findSubFolder(in ACString escapedSubFolderName);
+
+  void AddFolderListener(in nsIFolderListener listener);
+  void RemoveFolderListener(in nsIFolderListener listener);
+
+  // These notification functions invoke the appropriate nsIFolderListener
+  // method on all the listeners attached to this folder, and _also_
+  // all the nsIFolderListeners registered in the MailSession.
+  // See nsIMsgMailSession AddFolderListener()/RemoveFolderListener().
+  void NotifyPropertyChanged(in ACString property,
+                             in ACString oldValue,
+                             in ACString newValue);
+  void NotifyIntPropertyChanged(in ACString property,
+                                in long long oldValue,
+                                in long long newValue);
+  void NotifyBoolPropertyChanged(in ACString property,
+                                 in boolean oldValue,
+                                 in boolean newValue);
+  void NotifyPropertyFlagChanged(in nsIMsgDBHdr item,
+                                 in ACString property,
+                                 in unsigned long oldValue,
+                                 in unsigned long newValue);
+  void NotifyUnicharPropertyChanged(in ACString property,
+                                    in AString oldValue,
+                                    in AString newValue);
+
+  void notifyMessageAdded(in nsIMsgDBHdr msg);
+  void notifyMessageRemoved(in nsIMsgDBHdr msg);
+  void notifyFolderAdded(in nsIMsgFolder child);
+  void notifyFolderRemoved(in nsIMsgFolder child);
+
+  void NotifyFolderEvent(in ACString event);
+
+  // Gets all descendants, not just first level children.
+  readonly attribute Array<nsIMsgFolder> descendants;
+  void Shutdown(in boolean shutdownChildren);
+
+  void copyDataToOutputStreamForAppend(in nsIInputStream aIStream,
+                     in long aLength, in nsIOutputStream outputStream);
+  void copyDataDone();
+  void setJunkScoreForMessages(in Array<nsIMsgDBHdr> aMessages, in ACString aJunkScore);
+  void applyRetentionSettings();
+
+  /**
+   * Get the beginning of the message bodies for the passed in keys and store
+   * them in the msg hdr property "preview". This is intended for
+   * new mail alerts, title tips on folders with new messages, and perhaps
+   * titletips/message preview in the thread pane.
+   *
+   * @param aKeysToFetch   keys of msgs to fetch
+   * @param aUrlListener   url listener to notify if we run url to fetch msgs
+   *
+   * @result aAsyncResults if true, we ran a url to fetch one or more of msg bodies
+   *
+   */
+  boolean fetchMsgPreviewText(in Array<nsMsgKey> aKeysToFetch,
+                              in nsIUrlListener aUrlListener);
+
+  // used to set/clear tags - we could have a single method to setKeywords which
+  // would figure out the diffs, but these methods might be more convenient.
+  // keywords are space delimited, in the case of multiple keywords
+  void addKeywordsToMessages(in Array<nsIMsgDBHdr> aMessages, in ACString aKeywords);
+  void removeKeywordsFromMessages(in Array<nsIMsgDBHdr> aMessages, in ACString aKeywords);
+  /**
+   * Extract the message text from aStream.
+   *
+   * @param aStream stream to read from
+   * @param aCharset character set to use to interpret the body. If an empty string, then the
+   *        charset is retrieved from the headers. msgHdr.charset is recommended in case you have it.
+   * @param aBytesToRead number of bytes to read from the stream. The function will read till the end
+   *        of the line, and there will also be some read ahead due to NS_ReadLine
+   * @param aMaxOutputLen desired length of the converted message text. Used to control how many characters
+   *        of msg text we want to store.
+   * @param aCompressQuotes Replace quotes and citations with " ... " in the preview text
+   * @param aStripHTMLTags strip HTML tags from the output, if present
+   * @param[out] aContentType the content type of the MIME part that was used to generate the text --
+   *             for an HTML part, this will be "text/html" even though aStripHTMLTags might be true
+   */
+  AUTF8String getMsgTextFromStream(in nsIInputStream aStream, in ACString aCharset,
+                                   in unsigned long aBytesToRead, in unsigned long aMaxOutputLen,
+                                   in boolean aCompressQuotes, in boolean aStripHTMLTags,
+                                   out ACString aContentType);
+
+  AString convertMsgSnippetToPlainText(in AString aMessageText);
+
+  // this allows a folder to have a special identity. E.g., you might want to
+  // associate an identity with a particular newsgroup, or for IMAP shared folders in
+  // the other users namespace, you might want to create a delegated identity
+  readonly attribute nsIMsgIdentity customIdentity;
+
+  /**
+   * @{
+   * Processing flags, used to manage message processing.
+   *
+   * @param msgKey   message key
+   * @return         processing flags
+   */
+  unsigned long getProcessingFlags(in nsMsgKey msgKey);
+
+  /**
+   * @param msgKey   message key
+   * @param mask     mask to OR into the flags
+   */
+  void orProcessingFlags(in nsMsgKey msgKey, in unsigned long mask);
+
+  /**
+   * @param msgKey   message key
+   * @param mask     mask to AND into the flags
+   */
+  void andProcessingFlags(in nsMsgKey msgKey, in unsigned long mask);
+  /** @} */
+
+  /**
+   * Gets an inherited string property from the folder.
+   *
+   * If the forcePropertyEmpty boolean is set (see below), return an
+   * empty string.
+   *
+   * If the specified folder has a non-empty value for the property,
+   * return that value. Otherwise, return getInheritedStringProperty
+   * for the folder's parent.
+   *
+   * If a folder is the root folder for a server, then instead of
+   * checking the folder property, check the property of the same name
+   * for the server using nsIMsgIncomingServer.getCharValue(...)
+   *
+   * Note nsIMsgIncomingServer.getCharValue for a server inherits from
+   * the preference mail.server.default.(propertyName) as a global value
+   *
+   * (ex: if propertyName = "IAmAGlobal" and no folder nor server properties
+   * are set, then the inherited property will return the preference value
+   * mail.server.default.IAmAGlobal)
+   *
+   * If the propertyName is undefined, returns an empty, void string.
+   *
+   * @param propertyName  The name of the property for the value to retrieve.
+   */
+  ACString getInheritedStringProperty(in string propertyName);
+
+  /**
+   * Set a boolean to force an inherited propertyName to return empty instead
+   * of inheriting from a parent folder, server, or the global
+   *
+   * @param propertyName         The name of the property
+   * @param aForcePropertyEmpty  true if an empty inherited property should be returned
+   */
+  void setForcePropertyEmpty(in string propertyName, in boolean aForcePropertyEmpty);
+
+  /**
+   * Get a boolean to force an inherited propertyName to return empty instead
+   * of inheriting from a parent folder, server, or the global
+   *
+   * @param propertyName      The name of the property
+   *
+   * @return                  true if an empty inherited property should be returned
+   */
+  boolean getForcePropertyEmpty(in string propertyName);
+
+  /**
+   * Pluggable store for this folder. Currently, this will always be the same
+   * as the pluggable store for the server.
+   */
+  readonly attribute nsIMsgPluggableStore msgStore;
+
+  /**
+   * Protocol type, i.e. "pop3", "imap", "nntp", "none", etc
+   * used to construct URLs for this account type.
+   */
+  readonly attribute ACString incomingServerType;
+};
diff --git a/comm/mailnews/base/public/nsIMsgFolderCache.idl b/comm/mailnews/base/public/nsIMsgFolderCache.idl
new file mode 100644
index 0000000000..b5ba40afdc
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgFolderCache.idl
@@ -0,0 +1,48 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIFile;
+interface nsIMsgFolderCacheElement;
+
+/**
+ * nsIMsgFolderCache is a store of values which might be slow for the folder
+ * to calculate. For example: the number of unread messages.
+ * The account manager holds the cache, and each folder manipulates its cached
+ * properties via nsIMsgFolderCacheElement.
+ */
+[scriptable, uuid(78C2B6A2-E29F-44de-9543-10DBB51E245C)]
+interface nsIMsgFolderCache : nsISupports
+{
+  /**
+   * Set up the cache, loading/saving to cacheFile.
+   * If a new-style cacheFile isn't found, it looks for an old panacea.dat,
+   * specified by legacyFile and migrates it to the new format.
+   * Neither file has to exist - it'll just start up with an empty cache.
+   * nsMsgFolderCache (the only implementation) will autosave to cacheFile
+   * when changes are made.
+   *
+   * @param cacheFile   File to persist the cache data (folderCache.json).
+   * @param legacyFile  Old panacea.dat file to check for and migrate, if
+   *                    cacheFile doesn't exist.
+   */
+  void init(in nsIFile cacheFile, in nsIFile legacyFile);
+
+  /**
+   * Return an nsIMsgFolderCacheElement for a given folder.
+   * Unless createIfMissing is set, a missing entry will cause failure.
+   */
+  nsIMsgFolderCacheElement getCacheElement(in ACString key, in boolean createIfMissing);
+  void removeElement(in ACString key);
+
+  /**
+   * Write immediately to cacheFile if any data has been changed.
+   * Write immediately to cacheFile if any data has been changed.
+   * This happens in the cache dtor anyway, but we use it during shutdown and
+   * in unit testing (so tests don't have to wait for JS garbage collection).
+   */
+  void flush();
+};
diff --git a/comm/mailnews/base/public/nsIMsgFolderCacheElement.idl b/comm/mailnews/base/public/nsIMsgFolderCacheElement.idl
new file mode 100644
index 0000000000..dd4b54c4f0
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgFolderCacheElement.idl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * Interface for a folder to get/set its values in the foldercache.
+ */
+[scriptable, uuid(c7392b12-f68a-46b2-af5e-d47350bb17c3)]
+interface nsIMsgFolderCacheElement : nsISupports
+{
+  readonly attribute ACString key;
+  // Notes on the getCached...() functions:
+  // - They will fail if the property doesn't exist. That is, they'll
+  //   throw an exception in JS, or return an NS_ERROR_* code in C++.
+  // - null values are returned as empty string (for getCachedString()),
+  //   or zero (for the numeric accessors). NOTE: there should be no
+  //   way to actually set properties to null, but the
+  //   panacea.dat->folderCache.json might have introduced some, so we
+  //   need to handle them.
+  // - On the C++ side there is legacy code which calls these functions
+  //   without checking the error code and relies on the return value
+  //   remaining unchanged if the function fails.
+  AUTF8String getCachedString(in string propertyName);
+  long getCachedInt32(in string propertyName);
+  unsigned long getCachedUInt32(in string propertyName);
+  long long getCachedInt64(in string propertyName);
+
+  void setCachedString(in string propertyName, in AUTF8String propertyValue);
+  void setCachedInt32(in string propertyName, in long propertyValue);
+  void setCachedUInt32(in string propertyName, in unsigned long propertyValue);
+  void setCachedInt64(in string propertyName, in long long propertyValue);
+};
diff --git a/comm/mailnews/base/public/nsIMsgFolderCompactor.idl b/comm/mailnews/base/public/nsIMsgFolderCompactor.idl
new file mode 100644
index 0000000000..96df873f32
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgFolderCompactor.idl
@@ -0,0 +1,34 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgFolder;
+interface nsIMsgWindow;
+interface nsIUrlListener;
+
+[scriptable, uuid(38c7e876-3083-4aea-8dcd-0ea0ec1753a3)]
+
+/**
+ * Use this for any object that wants to handle compacting folders.
+ * Currently, the folders themselves create this object.
+ */
+
+interface nsIMsgFolderCompactor :  nsISupports
+{
+  /**
+   * Compact the passed in array of folders.
+   *
+   * @param folders              The folders to compact.
+   * @param listener             Notified of completion, can be null.
+   *                             OnStartRunningUrl() will not be called.
+   *                             OnStopRunningUrl() will be called upon
+   *                             completion, with a null URL.
+   * @param window               Used for progress/status, can be null.
+   */
+  void compactFolders(in Array<nsIMsgFolder> folders,
+                      in nsIUrlListener listener,
+                      in nsIMsgWindow window);
+};
diff --git a/comm/mailnews/base/public/nsIMsgFolderListener.idl b/comm/mailnews/base/public/nsIMsgFolderListener.idl
new file mode 100644
index 0000000000..34932a3361
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgFolderListener.idl
@@ -0,0 +1,227 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+interface nsIMsgDBHdr;
+interface nsIMsgFolder;
+
+/**
+ * nsIMsgFolderListener defines the callbacks which are invoked by
+ * nsIMsgFolderNotificationService.
+ *
+ * This is similar to nsIFolderListener, but with slightly different semantics,
+ * especially w.r.t. moving messages and folders.  Some listeners want to know
+ * about moves, instead of getting an itemAdded and itemRemoved notification.
+ * Folder listeners also only tend to get called if a view is open on the folder,
+ * which is not always the case. I don't want to change nsIFolderListener at this
+ * point since there are lots of extensions that rely on it. Eventually,
+ * these two interfaces should be combined somehow.
+ */
+
+[scriptable, uuid(2f87be72-0565-4e64-a824-0eb9c258f884)]
+interface nsIMsgFolderListener : nsISupports {
+  /**
+   * Notified immediately after a message is added to a folder. This could be a
+   * new incoming message to a local folder, or a new message in an IMAP folder
+   * when it is opened.
+   *
+   * You may want to consider using the msgsClassified notification instead of
+   * this notification if any of the following are true:
+   *
+   * - You only want to be notified about messages after junk classification
+   *   has occurred (if it is going to occur for a message).  This also goes for
+   *   trait classification which is a generic use of the bayesian engine at
+   *   the heart of the spam logic.
+   *
+   * - You only want to be notified about messages after all filters have been
+   *   run.  Although some filters may be run before the msgAdded notification
+   *   is generated, filters dependent on junk/trait classification wait until
+   *   classification completes.
+   *
+   * @param aMsg The message header that was just added
+   */
+  void msgAdded(in nsIMsgDBHdr aMsg);
+
+  /**
+   * Notification that (new to the client) messages have been through junk and
+   * trait classification.  This event will occur for all messages at some point
+   * after their existence is revealed by msgAdded.
+   *
+   * Because junk classification does not run if no messages have ever been
+   * marked as junk by the user, it is possible to receive this message without
+   * any classification having actually been performed.  We still generate the
+   * notification in this case so that code is reliably notified about the
+   * existence of the new message headers.
+   *
+   * @param aMsgs The message headers that have been classified or were
+   *     intentionally not classified.
+   * @param aJunkProcessed Were the messages processed for junk classification?
+   * @param aTraitProcessed Were the messages processed for trait
+   *     classification?
+   */
+  void msgsClassified(in Array<nsIMsgDBHdr> aMsgs, in boolean aJunkProcessed,
+                      in boolean aTraitProcessed);
+
+  /**
+   * msgsJunkStatusChanged indicates that some messages that had already been
+   * reported by msgsClassified have had their junk status changed.  This
+   * event will not fire for the initial automatic classification of
+   * messages; msgsClassified will tell you about those messages.
+   * This is not guaranteed to be a comprehensive source of junk
+   * notification events; right now any time an nsMsgDBView marks things as
+   * junk/non-junk a notification is produced.
+   *
+   * @param {nsIMsgDBHdr[]} messages - The affected messages.
+   *
+   */
+  void msgsJunkStatusChanged(in Array<nsIMsgDBHdr> messages);
+
+  /**
+   * Notified after a command to delete a group of messages has been given, but before the
+   * messages have actually been deleted.
+   *
+   * @param aMsgs An array of the message headers about to be deleted
+   *
+   * @note
+   * This notification will not take place if the messages are being deleted from the folder
+   * as the result of a move to another folder. Instead, the msgsMoveCopyCompleted() notification
+   * takes place.
+   *
+   * @note
+   * "Deleting" to a trash folder is actually a move, and is covered by msgsMoveCopyCompleted()
+   *
+   * @note
+   * If the user has selected the IMAP delete model (marking messages as deleted, then purging them
+   * later) for an IMAP account, this notification will not take place on the delete. This will only
+   * take place on the purge.
+   */
+  void msgsDeleted(in Array<nsIMsgDBHdr> aMsgs);
+
+  /**
+   * Notified after a command to move or copy a group of messages completes. In
+   * case of a move, this is before the messages have been deleted from the
+   * source folder.
+   *
+   * @param aMove true if a move, false if a copy
+   * @param aSrcMsgs An array of the message headers in the source folder
+   * @param aDestFolder The folder these messages were moved to.
+   * @param aDestMsgs This provides the list of target message headers.
+                      For imap messages, these will be "pseudo" headers, with
+                      a made up UID. When we download the "real" header, we
+                      will send a msgKeyChanged notification. Currently, if
+                      the imap move/copy happens strictly online (essentially,
+                      not user-initiated), then aDestMsgs will be null.
+   *
+   * @note
+   * If messages are moved from a server which uses the IMAP delete model,
+   * you'll get aMove = false. That's because the messages are not deleted from
+   * the source database, but instead simply marked deleted.
+   */
+  void msgsMoveCopyCompleted(in boolean aMove,
+                             in Array<nsIMsgDBHdr> aSrcMsgs,
+                             in nsIMsgFolder aDestFolder,
+                             in Array<nsIMsgDBHdr> aDestMsgs);
+
+  /**
+   * Notification sent when the msg key for a header may have changed.
+   * This is used when we create a header for an offline imap move result,
+   * without knowing what the ultimate UID will be. When we download the
+   * headers for the new message, we replace the old "pseudo" header with
+   * a new header that has the correct UID/message key. The uid of the new hdr
+   * may turn out to be the same as aOldKey if we've guessed correctly but
+   * the listener can use this notification to know that it can ignore the
+   * msgAdded notification that's coming for aNewHdr. We do NOT send a
+   * msgsDeleted notification for the pseudo header.
+   *
+   * @param aOldKey The fake UID. The header with this key has been removed
+   *                by the time this is called.
+   * @param aNewHdr The header that replaces the header with aOldKey.
+   */
+  void msgKeyChanged(in nsMsgKey aOldKey, in nsIMsgDBHdr aNewHdr);
+
+  /**
+   * msgUnincorporatedMoved: A message received via POP was moved by a
+   * "before junk" rule.
+   *
+   * @param {nsIMsgFolder} srcFolder - Folder the message was moved from.
+   * @param {nsIMsgDBHdr} msg - The message.
+   */
+  void msgUnincorporatedMoved(in nsIMsgFolder srcFolder, in nsIMsgDBHdr msg);
+
+  /**
+   * Notified after a folder has been added.
+   *
+   * @param aFolder The folder that has just been added
+   */
+  void folderAdded(in nsIMsgFolder aFolder);
+
+  /**
+   * Notified after a folder has been deleted and its corresponding file(s) deleted from disk.
+   *
+   * @param aFolder The folder that has just been deleted
+   *
+   * @note
+   * "Deleting" to a trash folder is actually a move, and is covered by folderMoveCopyCompleted()
+   */
+  void folderDeleted(in nsIMsgFolder aFolder);
+
+  /**
+   * Notified after a command to move or copy a folder completes. In case of a move, at this point,
+   * the original folder and its files have already been moved to the new location.
+   *
+   * @param aMove true if a move, false if a copy
+   * @param aSrcFolder The original folder that was moved
+   * @param aDestFolder The parent folder this folder was moved to
+   */
+  void folderMoveCopyCompleted(in boolean aMove,
+                               in nsIMsgFolder aSrcFolder,
+                               in nsIMsgFolder aDestFolder);
+
+  /**
+   * Notified after a folder is renamed.
+   *
+   * @param aOrigFolder The folder with the old name
+   * @param aNewFolder The folder with the new name
+   */
+  void folderRenamed(in nsIMsgFolder aOrigFolder, in nsIMsgFolder aNewFolder);
+
+
+  /**
+   * Called to indicate nsIMsgFolderCompactor is beginning compaction of the
+   * folder.  If the summary file was missing or out-of-date and a parse
+   * is required, this notification will come after the completion of the
+   * parse.  The compactor will be holding the folder's semaphore when
+   * this notification is generated.  This only happens for local folders
+   * currently.
+   *
+   * @param {nsIMsgFolder} folder - Target folder of the compaction.
+   */
+  void folderCompactStart(in nsIMsgFolder folder);
+
+
+  /**
+   * Called when nsIMsgFolderCompactor has completed compaction of the folder.
+   * At this point, the folder semaphore has been released and the database
+   * has been committed.
+   *
+   * @param {nsIMsgFolder} folder - Target folder of the compaction.
+   */
+  void folderCompactFinish(in nsIMsgFolder folder);
+
+  /**
+   * The user has opted to rebuild the mork msf index for a folder.
+   * Following this notification, the database will be closed, backed up
+   * (so that header properties can be propagated), and then rebuilt from the
+   * source. The rebuild is triggered by a call to updateFolder, so an
+   * nsIFolderListener OnFolderEvent(folder, FolderLoaded atom) notification
+   * will be received if you want to know when this is all completed.
+   * Note: this event is only generated for Thunderbird because the event
+   * currently comes from Thunderbird-specific code.
+   *
+   * @param {nsIMsgFolder} folder - The folder being reindexed.
+   */
+  void folderReindexTriggered(in nsIMsgFolder folder);
+};
diff --git a/comm/mailnews/base/public/nsIMsgFolderNotificationService.idl b/comm/mailnews/base/public/nsIMsgFolderNotificationService.idl
new file mode 100644
index 0000000000..79cf0fb7d2
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgFolderNotificationService.idl
@@ -0,0 +1,119 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+interface nsIMsgDBHdr;
+interface nsIMsgFolder;
+interface nsIMsgFolderListener;
+
+typedef unsigned long msgFolderListenerFlag;
+
+
+/**
+ * nsIMsgFolderNotificationService provides a central point for sending out
+ * notifications related to folders.
+ * nsIMsgFolderListeners are registered with the service along with flags to
+ * indicate which kinds of notifications are of interest.
+ */
+[scriptable, uuid(e54a592c-2f23-4771-9670-bdb9d4f5dbbd)]
+interface nsIMsgFolderNotificationService : nsISupports {
+  /**
+   * @name Notification flags
+   * These flags determine which notifications will be sent.
+   * @{
+   */
+  /// nsIMsgFolderListener::msgAdded notification
+  const msgFolderListenerFlag msgAdded = 0x1;
+
+  /// nsIMsgFolderListener::msgsDeleted notification
+  const msgFolderListenerFlag msgsDeleted = 0x2;
+
+  /// nsIMsgFolderListener::msgsMoveCopyCompleted notification
+  const msgFolderListenerFlag msgsMoveCopyCompleted = 0x4;
+
+  /// nsIMsgFolderListener::msgsClassified notification
+  const msgFolderListenerFlag msgsClassified = 0x8;
+
+  /// nsIMsgFolderListener::msgsJunkStatusChanged notification
+  const msgFolderListenerFlag msgsJunkStatusChanged = 0x10;
+
+  /// nsIMsgFolderListener::msgUnincorporatedMoved notification
+  const msgFolderListenerFlag msgUnincorporatedMoved = 0x20;
+
+  /// nsIMsgFolderListener::folderAdded notification
+  const msgFolderListenerFlag folderAdded = 0x8000;
+
+  /// nsIMsgFolderListener::folderDeleted notification
+  const msgFolderListenerFlag folderDeleted = 0x1000;
+
+  /// nsIMsgFolderListener::folderMoveCopyCompleted notification
+  const msgFolderListenerFlag folderMoveCopyCompleted = 0x2000;
+
+  /// nsIMsgFolderListener::folderRenamed notification
+  const msgFolderListenerFlag folderRenamed = 0x4000;
+
+  /// nsIMsgFolderListener::folderCompactStart notification
+  const msgFolderListenerFlag folderCompactStart = 0x10000;
+
+  /// nsIMsgFolderListener::folderCompactFinish notification
+  const msgFolderListenerFlag folderCompactFinish = 0x20000;
+
+  /// nsIMsgFolderListener::folderReindexTriggered notification
+  const msgFolderListenerFlag folderReindexTriggered = 0x40000;
+
+  /// nsIMsgFolderListener::msgKeyChanged notification
+  const msgFolderListenerFlag msgKeyChanged = 0x2000000;
+
+  /** @} */
+
+  readonly attribute boolean hasListeners;
+  void addListener(in nsIMsgFolderListener aListener,
+                   in msgFolderListenerFlag flags);
+  void removeListener(in nsIMsgFolderListener aListener);
+
+  // message-specific functions
+  // single message for added, array for delete/move/copy
+  void notifyMsgAdded(in nsIMsgDBHdr aMsg);
+  void notifyMsgsClassified(in Array<nsIMsgDBHdr> aMsgs,
+                            in boolean aJunkProcessed,
+                            in boolean aTraitProcessed);
+  void notifyMsgsJunkStatusChanged(in Array<nsIMsgDBHdr> messages);
+  void notifyMsgsDeleted(in Array<nsIMsgDBHdr> aMsgs);
+  void notifyMsgsMoveCopyCompleted(in boolean aMove,
+                                   in Array<nsIMsgDBHdr> aSrcMsgs,
+                                   in nsIMsgFolder aDestFolder,
+                                   in Array<nsIMsgDBHdr> aDestMsgs);
+
+  /**
+   * Notify listeners that the msg key for a header has changed. Currently,
+   * this is used when we create a header for an offline imap move result,
+   * without knowing what the ultimate UID will be. When we download the
+   * headers for the new message, we replace the old "pseudo" header with
+   * a new header that has the correct UID/message key, by cloning the pseudo
+   * header, which maintains all the existing header attributes.
+   *
+   * @param aOldKey The fake UID. The header with this key has been removed
+   *                by the time this is called.
+   * @param aNewHdr The header that replaces the header with aOldKey.
+   */
+  void notifyMsgKeyChanged(in nsMsgKey aOldKey, in nsIMsgDBHdr aNewHdr);
+
+  void notifyMsgUnincorporatedMoved(in nsIMsgFolder srcFolder, in nsIMsgDBHdr msg);
+
+  // folder specific functions
+  // single folders, all the time
+  void notifyFolderAdded(in nsIMsgFolder aFolder);
+  void notifyFolderDeleted(in nsIMsgFolder aFolder);
+  void notifyFolderMoveCopyCompleted(in boolean aMove,
+                                     in nsIMsgFolder aSrcFolder,
+                                     in nsIMsgFolder aDestFolder);
+  void notifyFolderRenamed(in nsIMsgFolder aOrigFolder,
+                           in nsIMsgFolder aNewFolder);
+
+  void notifyFolderCompactStart(in nsIMsgFolder folder);
+  void notifyFolderCompactFinish(in nsIMsgFolder folder);
+  void notifyFolderReindexTriggered(in nsIMsgFolder folder);
+};
diff --git a/comm/mailnews/base/public/nsIMsgHdr.idl b/comm/mailnews/base/public/nsIMsgHdr.idl
new file mode 100644
index 0000000000..14dc6cddf1
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgHdr.idl
@@ -0,0 +1,109 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+#include "MailNewsTypes2.idl"
+
+interface nsIMsgFolder;
+interface nsIUTF8StringEnumerator;
+
+[scriptable, uuid(3c11ddbe-c805-40c5-b9c9-d065fad5d0be)]
+interface nsIMsgDBHdr : nsISupports
+{
+    void setStringProperty(in string propertyName, in  AUTF8String propertyValue);
+    AUTF8String getStringProperty(in string propertyName);
+    unsigned long getUint32Property(in string propertyName);
+    void setUint32Property(in string propertyName,
+                           in unsigned long propertyVal);
+
+    // accessors, to make our JS cleaner
+    readonly attribute boolean isRead;
+    readonly attribute boolean isFlagged;
+
+    // Special accessor that checks if a message is part of an ignored subthread
+    readonly attribute boolean isKilled;
+
+    // Mark message routines
+    void markRead(in boolean read);
+    void markFlagged(in boolean flagged);
+    void markHasAttachments(in boolean hasAttachments);
+
+    attribute nsMsgPriorityValue priority;
+
+    /* flag handling routines */
+    attribute unsigned long flags;
+    unsigned long orFlags(in unsigned long flags);
+    unsigned long andFlags(in unsigned long flags);
+
+    /* various threading stuff */
+    attribute nsMsgKey threadId;
+    attribute nsMsgKey messageKey;
+    attribute nsMsgKey threadParent;
+
+    /* meta information about the message, learned from reading the message */
+
+    /**
+     * For "Offline" supporting folders (IMAP, NNTP), .messageSize is
+     * the size of the original message on the server.
+     * For Local folders, this is the exact size of the message as written to
+     * the msgStore.
+     * See also Bug 1764857.
+     */
+    attribute unsigned long messageSize;
+    attribute unsigned long lineCount;
+    /**
+     * The offset into the local folder/offline store of the message. This
+     * will be pluggable store-dependent, e.g., for mail dir it should
+     * always be 0.
+     */
+    attribute unsigned long long messageOffset;
+    /**
+     * For "Offline" supporting folders (IMAP, NNTP): .offlineMessageSize is
+     * the exact size of the local copy of the message in the msgStore.
+     * If the message is not flagged Offline, this will be zero or unset.
+     * For Local folders, this is unset or zero.
+     * See also Bug 1764857.
+     */
+    attribute unsigned long offlineMessageSize;
+    /* common headers */
+    attribute PRTime date;
+    readonly attribute unsigned long dateInSeconds;
+    attribute string messageId;
+    attribute string ccList;
+    attribute string bccList;
+    attribute string author;
+    attribute AUTF8String subject;
+    attribute string recipients;
+
+    /* anything below here still has to be fixed */
+    void setReferences(in AUTF8String references);
+    readonly attribute unsigned short numReferences;
+    AUTF8String getStringReference(in long refNum);
+
+    readonly attribute AString mime2DecodedAuthor;
+    readonly attribute AString mime2DecodedSubject;
+    readonly attribute AString mime2DecodedRecipients;
+
+    Array<octet> getAuthorCollationKey();
+    Array<octet> getSubjectCollationKey();
+    Array<octet> getRecipientsCollationKey();
+
+    attribute string charset;
+
+    /**
+     * Returns the effective character set for the message (@ref charset).
+     * For NNTP, if there is no specific set defined for the message,
+     * the character set of the server instead.
+     */
+    readonly attribute ACString effectiveCharset;
+
+    attribute string accountKey;
+    readonly attribute nsIMsgFolder folder;
+
+    /// Array of names of all database properties in the header.
+    readonly attribute Array<AUTF8String> properties;
+};
+/* *******************************************************************************/
diff --git a/comm/mailnews/base/public/nsIMsgIdentity.idl b/comm/mailnews/base/public/nsIMsgIdentity.idl
new file mode 100644
index 0000000000..f02a240694
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgIdentity.idl
@@ -0,0 +1,311 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIFile.idl"
+
+/**
+ * This interface contains all the personal outgoing mail information
+ * for a given person.
+ * Each identity is identified by a key, which is the <id> string in
+ * the identity preferences, such as in mail.identity.<id>.replyTo.
+ */
+[scriptable, uuid(9dede9a0-f6fc-4afc-8fc9-a6af52414b3d)]
+interface nsIMsgIdentity : nsISupports {
+  /**
+   * Internal preferences ID.
+   */
+  attribute ACString key;
+
+  /**
+   * A unique identifier for this identity that can be used for the same
+   * identity synced across multiple profiles. Auto-generated on first use.
+   */
+  attribute AUTF8String UID;
+
+  /**
+   * Label describing this identity. May be empty.
+   */
+  attribute AString label;
+
+  /**
+   * Pretty display name to identify this specific identity. Will return a
+   * composed string like "fullname <email> (label)".
+   */
+  readonly attribute AString identityName;
+
+  /**
+   * User's full name, i.e. John Doe.
+   */
+  attribute AString fullName;
+
+  /**
+   * User's e-mail address, i.e. john@doe.com.
+   */
+  attribute ACString email;
+
+  /**
+   * Do we use multiple e-mail addresses (like Catch-All) with this identity?
+   */
+  attribute boolean catchAll;
+
+  /**
+   * Hint for when to use this identity as catch all. It is a comma separated
+   * list of things to look for delivery in headers when replying to a message
+   * that was not directly addressed to a matching identity.
+   */
+  attribute AUTF8String catchAllHint;
+
+  /**
+   * Formats fullName and email into the proper string to use as sender:
+   * name <email>
+   */
+  readonly attribute AString fullAddress;
+
+  /**
+   * Optional replyTo address, i.e. johnNOSPAM@doe.com.
+   */
+  attribute AUTF8String replyTo;
+
+  /**
+   * Optional organization.
+   */
+  attribute AString organization;
+
+  /**
+   * Should we compose with HTML by default?
+   */
+  attribute boolean composeHtml;
+
+  /**
+   * Should we attach a signature from file?
+   */
+  attribute boolean attachSignature;
+
+  /**
+   * Should we attach a vcard by default?
+   */
+  attribute boolean attachVCard;
+
+  /**
+   * Should we automatically quote the original message?
+   */
+  attribute boolean autoQuote;
+
+  /**
+   * What should our quoting preference be?
+   */
+  attribute long replyOnTop;
+
+  /**
+   * Should our signature be at the end of the quoted text when replying
+   * above it?
+   */
+  attribute boolean sigBottom;
+
+  /**
+   * Include a signature when forwarding a message?
+   */
+  attribute boolean sigOnForward;
+
+  /**
+   * Include a signature when replying to a message?
+   */
+  attribute boolean sigOnReply;
+
+  /**
+   * The current signature file.
+   */
+  attribute nsIFile signature;
+
+  /**
+   * Modification time of the signature file.
+   */
+  attribute long signatureDate;
+
+  /**
+   * Signature text if not read from file; format depends on htmlSigFormat.
+   */
+  attribute AString htmlSigText;
+
+  /**
+   * Does htmlSigText contain HTML? Use plain text if false.
+   */
+  attribute boolean htmlSigFormat;
+
+  /**
+   * Suppress the double-dash signature separator
+   */
+  attribute boolean suppressSigSep;
+
+  /**
+   * The encoded string representing the vcard.
+   */
+  attribute ACString escapedVCard;
+
+  attribute boolean doFcc;
+  /// URI for the fcc (Sent) folder
+  attribute AUTF8String fccFolder;
+  attribute boolean fccReplyFollowsParent;
+
+  /**
+   * @{
+   * these attributes control whether the special folder pickers for
+   * fcc, drafts,archives, and templates are set to pick between servers
+   * (e.g., Sent on accountName) or to pick any folder on any account.
+   * "0" means choose between servers; "1" means use the full folder picker.
+   */
+  attribute ACString fccFolderPickerMode;
+  attribute ACString draftsFolderPickerMode;
+  attribute ACString archivesFolderPickerMode;
+  attribute ACString tmplFolderPickerMode;
+  /** @} */
+
+  // Don't call bccSelf, bccOthers, and bccList directly, they are
+  // only used for migration and backward compatibility. Use doBcc
+  // and doBccList instead.
+  attribute boolean bccSelf;
+  attribute boolean bccOthers;
+  attribute ACString bccList;
+
+  attribute boolean doCc;
+  attribute AUTF8String doCcList;
+
+  attribute boolean doBcc;
+  attribute AUTF8String doBccList;
+  /**
+   * @{
+   * URIs for the special folders (drafts, templates, archive)
+   */
+  attribute AUTF8String draftFolder;
+  attribute AUTF8String archiveFolder;
+  attribute AUTF8String stationeryFolder;
+  /** @} */
+
+  attribute boolean archiveEnabled;
+  /**
+   * @{
+   * This attribute and constants control the granularity of sub-folders of the
+   * Archives folder - either messages go in the single archive folder, or a
+   * yearly archive folder, or in a monthly archive folder with a yearly
+   * parent folder. If the server doesn't support folders that both contain
+   * messages and have sub-folders, we will ignore this setting.
+   */
+  attribute long archiveGranularity;
+  const long singleArchiveFolder = 0;
+  const long perYearArchiveFolders = 1;
+  const long perMonthArchiveFolders = 2;
+  /// Maintain the source folder name when creating Archive subfolders
+  attribute boolean archiveKeepFolderStructure;
+  /** @} */
+
+  attribute boolean showSaveMsgDlg;
+  attribute ACString directoryServer;
+  attribute boolean overrideGlobalPref;
+  /**
+   * If this is false, don't append the user's domain
+   * to an autocomplete address with no matches
+   */
+   attribute boolean autocompleteToMyDomain;
+  /**
+   * valid determines if the UI should use this identity
+   * and the wizard uses this to determine whether or not
+   * to ask the user to complete all the fields
+   */
+  attribute boolean valid;
+
+  /**
+   * this is really dangerous. this destroys all pref values
+   * do not call this unless you know what you're doing!
+   */
+  void clearAllValues();
+
+  /**
+   * the preferred smtp server for this identity.
+   * if this is set, this the smtp server that should be used
+   * for the message send
+   */
+  attribute ACString smtpServerKey;
+
+  /**
+   * default request for return receipt option for this identity
+   * if this is set, the Return Receipt menu item on the compose
+   * window will be checked
+   */
+  readonly attribute boolean requestReturnReceipt;
+  readonly attribute long receiptHeaderType;
+
+  /**
+   * default request for DSN option for this identity
+   * if this is set, the DSN menu item on the compose
+   * window will be checked
+   */
+  readonly attribute boolean requestDSN;
+
+  /**
+   * If true, include supported Autocrypt headers whenever sending a
+   * plain text or OpenPGP message. (Ignored when sending S/MIME.)
+   */
+  attribute boolean sendAutocryptHeaders;
+
+  /**
+   * If true, automatically attach the user's own public OpenPGP key
+   * whenever adding an OpenPGP digital signature.
+   */
+  attribute boolean attachPgpKey;
+
+  /**
+   * If true, encrypt draft messages that are saved to disk or on the
+   * mail server. This requires that a personal OpenPGP key or S/MIME
+   * certificate is configured and valid, matching the selected
+   * encryption technology for the current message.
+   */
+  attribute boolean autoEncryptDrafts;
+
+  /*
+   * If true, when sending an OpenPGP encrypted message, encrypt the
+   * email's subject, too.
+   */
+  attribute boolean protectSubject;
+
+  /*
+   * The default encryption setting for new emails that aren't already
+   * in an encryption context. (When forwarding or replying to an
+   * encrypted message we always automatically turn on encryption.)
+   * 0: disable encryption
+   * 1: optional encryption (not implemented)
+   * 2: require encryption
+   */
+  attribute long encryptionPolicy;
+
+  /*
+   * If true, add a digital signature for messages that aren't using
+   * encryption. (A message that uses encryption will automatically
+   * have signing enabled.)
+   */
+  attribute boolean signMail;
+
+  /* copy the attributes of the identity we pass in */
+  void copy(in nsIMsgIdentity identity);
+
+  /**
+   * these generic getter / setters, useful for extending mailnews
+   * note, these attributes persist across sessions
+   */
+  AString getUnicharAttribute(in string name);
+  void setUnicharAttribute(in string name, in AString value);
+
+  ACString getCharAttribute(in string name);
+  void setCharAttribute(in string name, in ACString value);
+
+  boolean getBoolAttribute(in string name);
+  void setBoolAttribute(in string name, in boolean value);
+
+  long getIntAttribute(in string name);
+  void setIntAttribute(in string name, in long value);
+
+  /* useful for debugging */
+  AString toString();
+};
diff --git a/comm/mailnews/base/public/nsIMsgIncomingServer.idl b/comm/mailnews/base/public/nsIMsgIncomingServer.idl
new file mode 100644
index 0000000000..c1b4c7e16d
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgIncomingServer.idl
@@ -0,0 +1,596 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+interface nsIMsgFolder;
+interface nsIMsgFolderCache;
+interface nsIMsgWindow;
+interface nsIMsgProtocolInfo;
+interface nsIMsgFilterList;
+interface nsIMsgRetentionSettings;
+interface nsIMsgDownloadSettings;
+interface nsISpamSettings;
+interface nsIMsgFilterPlugin;
+interface nsIUrlListener;
+interface nsIMsgDBHdr;
+interface nsIFile;
+interface nsIURI;
+interface nsIMsgPluggableStore;
+
+/*
+ * Interface for incoming mail/news host
+ * this is the base interface for all mail server types (imap, pop, nntp, etc)
+ * often you will want to add extra interfaces that give you server-specific
+ * attributes and methods.
+ */
+[scriptable, uuid(aa9a3389-9dac-41f1-9ec5-18287cfaa47c)]
+interface nsIMsgIncomingServer : nsISupports {
+
+  /**
+   * internal pref key - guaranteed to be unique across all servers
+   */
+  attribute ACString key;
+
+  /**
+   * A unique identifier for this server that can be used for the same
+   * server synced across multiple profiles. Auto-generated on first use.
+   */
+  attribute AUTF8String UID;
+
+  /**
+   * pretty name - should be "userid on hostname"
+   * if the pref is not set
+   */
+  attribute AString prettyName;
+
+  /**
+  * helper function to construct the pretty name in a server type
+  * specific way - e.g., mail for foo@test.com, news on news.mozilla.org
+  */
+  readonly attribute AString constructedPrettyName;
+
+  /**
+   * hostname of the server
+   */
+  attribute AUTF8String hostName;
+
+  /* port of the server */
+  attribute long port;
+
+  /**
+   * userid to log into the server
+   */
+  attribute AUTF8String username;
+
+  /**
+   * protocol type, i.e. "pop3", "imap", "nntp", "none", etc
+   * used to construct URLs
+   */
+  attribute ACString type;
+
+  /**
+   * The CLIENTID to use for this server.
+   * @see https://tools.ietf.org/html/draft-yu-imap-client-id-01
+   */
+  attribute ACString clientid;
+
+  /**
+   * Whether the CLIENTID feature above is enabled.
+   */
+  attribute boolean clientidEnabled;
+
+  /**
+   * The proper instance of nsIMsgProtocolInfo corresponding to this server type.
+   */
+  readonly attribute nsIMsgProtocolInfo protocolInfo;
+
+  readonly attribute AString accountManagerChrome;
+
+  /**
+   * The schema for the local mail store, such as "mailbox", "imap", or "news"
+   * used to construct URIs. The contractID for the nsIMsgMessageService
+   * implementation that will manage access to messages associated with this
+   * server is constructed using this type.
+   */
+  readonly attribute ACString localStoreType;
+
+  /**
+   * The schema for the nsIMsgDatabase implementation, such as "mailbox" or
+   * "imap", that will be used to construct the database instance used by
+   * message folders associated with this server.
+   */
+  readonly attribute ACString localDatabaseType;
+
+  // Perform specific tasks (reset flags, remove files, etc) for account user/server name changes.
+  void onUserOrHostNameChanged(in AUTF8String oldName, in AUTF8String newName,
+                               in bool hostnameChanged);
+
+  /// cleartext utf16 version of the password
+  attribute AString password;
+
+  /**
+   * Attempts to get the password first from the password manager, if that
+   * fails it will attempt to get it from the user if aMsgWindow is supplied.
+   *
+   * @param aPromptString  The text of the prompt if the user is prompted for
+   *                       password.
+   * @param aPromptTitle   The title of the prompt if the user is prompted.
+   * @return               The obtained password. Could be an empty password.
+   *
+   * @exception NS_ERROR_FAILURE  The password could not be obtained.
+   *
+   * @note NS_MSG_PASSWORD_PROMPT_CANCELLED is a success code that is returned
+   *       if the prompt was presented to the user but the user cancelled the
+   *       prompt.
+   */
+  AString getPasswordWithUI(in AString aPromptString, in AString aPromptTitle);
+
+  /* forget the password in memory and in single signon database */
+  void forgetPassword();
+
+  /**
+   * Forget the password in memory which is cached for the session.
+   *
+   * @param modifyLogin  Only relevant for nsImapIncomingServer override. When
+   *                     true and authentication method is oauth2, the password
+   *                     and user authenticated flag are not cleared.
+   */
+  void forgetSessionPassword(in boolean modifyLogin);
+
+  /* should we download whole messages when biff goes off? */
+  attribute boolean downloadOnBiff;
+
+  /* should we biff the server? */
+  attribute boolean doBiff;
+
+  /* how often to biff */
+  attribute long biffMinutes;
+
+  /* current biff state */
+  attribute unsigned long biffState;
+
+  /* are we running a url as a result of biff going off? (different from user clicking get msg) */
+  attribute boolean performingBiff;
+
+  /* the on-disk path to message storage for this server */
+  attribute nsIFile localPath;
+
+  /// message store to use for the folders under this server.
+  readonly attribute nsIMsgPluggableStore msgStore;
+
+  /* the RDF URI for the root mail folder */
+  readonly attribute AUTF8String serverURI;
+
+  /* the root folder for this server, even if server is deferred */
+  attribute nsIMsgFolder rootFolder;
+
+  /* root folder for this account
+     - if account is deferred, root folder of deferred-to account */
+  readonly attribute nsIMsgFolder rootMsgFolder;
+
+  /* are we already getting new Messages on the current server..
+     This is used to help us prevent multiple get new msg commands from
+     going off at the same time. */
+  attribute boolean serverBusy;
+
+  /**
+   * Is the server using a secure channel (SSL or STARTTLS).
+   */
+  readonly attribute boolean isSecure;
+
+  /**
+   * Authentication mechanism.
+   *
+   * @see nsMsgAuthMethod (in MailNewsTypes2.idl)
+   * Same as "mail.server...authMethod" pref
+   */
+  attribute nsMsgAuthMethodValue authMethod;
+
+  /**
+   * Whether to SSL or STARTTLS or not
+   *
+   * @see nsMsgSocketType (in MailNewsTypes2.idl)
+   * Same as "mail.server...socketType" pref
+   */
+  attribute nsMsgSocketTypeValue socketType;
+
+  /* empty trash on exit */
+  attribute boolean emptyTrashOnExit;
+
+  /**
+   * Get the server's list of filters.
+   *
+   * This SHOULD be the same filter list as the root folder's, if the server
+   * supports per-folder filters. Furthermore, this list SHOULD be used for all
+   * incoming messages.
+   *
+   * Since the returned nsIMsgFilterList is mutable, it is not necessary to call
+   * setFilterList after the filters have been changed.
+   *
+   * @param aMsgWindow  @ref msgwindow "The standard message window"
+   * @return            The list of filters.
+   */
+  nsIMsgFilterList getFilterList(in nsIMsgWindow aMsgWindow);
+
+  /**
+   * Set the server's list of filters.
+   *
+   * Note that this does not persist the filter list. To change the contents
+   * of the existing filters, use getFilterList and mutate the values as
+   * appropriate.
+   *
+   * @param aFilterList The new list of filters.
+   */
+  void setFilterList(in nsIMsgFilterList aFilterList);
+
+  /**
+   * Get user editable filter list. This does not have to be the same as
+   * the filterlist above, typically depending on the users preferences.
+   * The filters in this list are not processed, but only to be edited by
+   * the user.
+   * @see getFilterList
+   *
+   * @param aMsgWindow  @ref msgwindow "The standard message window"
+   * @return            The list of filters.
+   */
+  nsIMsgFilterList getEditableFilterList(in nsIMsgWindow aMsgWindow);
+
+  /**
+   * Set user editable filter list.
+   * This does not persist the filterlist, @see setFilterList
+   * @see getEditableFilterList
+   * @see setFilterList
+   *
+   * @param aFilterList The new list of filters.
+   */
+  void setEditableFilterList(in nsIMsgFilterList aFilterList);
+
+  /* we use this to set the default local path.  we use this when migrating prefs */
+  void setDefaultLocalPath(in nsIFile aDefaultLocalPath);
+
+  /**
+   * Verify that we can logon
+   *
+   * @param  aUrlListener - gets called back with success or failure.
+   * @param aMsgWindow         nsIMsgWindow to use for notification callbacks.
+   * @return - the url that we run.
+   */
+  nsIURI verifyLogon(in nsIUrlListener aUrlListener, in nsIMsgWindow aMsgWindow);
+
+  /* do a biff */
+  void performBiff(in nsIMsgWindow aMsgWindow);
+
+  /* get new messages */
+  void getNewMessages(in nsIMsgFolder aFolder, in nsIMsgWindow aMsgWindow,
+                      in nsIUrlListener aUrlListener);
+  /* this checks if a server needs a password to do biff */
+  readonly attribute boolean serverRequiresPasswordForBiff;
+
+  /* this gets called when the server is expanded in the folder pane */
+  void performExpand(in nsIMsgWindow aMsgWindow);
+
+  /* Write out all known folder data to folderCache */
+  void writeToFolderCache(in nsIMsgFolderCache folderCache);
+
+  /* close any server connections */
+  void closeCachedConnections();
+
+  /* ... */
+  void shutdown();
+
+  /**
+   * Get or set the value as determined by the preference tree.
+   *
+   * These methods MUST NOT fail if the preference is not set, and therefore
+   * they MUST have a default value. This default value is provided in practice
+   * by use of a default preference tree. The standard format for the pref
+   * branches are <tt>mail.server.<i>key</i>.</tt> for per-server preferences,
+   * such that the preference is <tt>mail.server.<i>key</i>.<i>attr</i></tt>.
+   *
+   * The attributes are passed in as strings for ease of access by the C++
+   * consumers of this method.
+   *
+   * @param attr  The value for which the preference should be accessed.
+   * @param value The value of the preference to set.
+   * @return      The value of the preference.
+   * @{
+   */
+  boolean getBoolValue(in string attr);
+  void setBoolValue(in string attr, in boolean value);
+
+  ACString getCharValue(in string attr);
+  void setCharValue(in string attr, in ACString value);
+
+  AString getUnicharValue(in string attr);
+  void setUnicharValue(in string attr, in AString value);
+
+  long getIntValue(in string attr);
+  void setIntValue(in string attr, in long value);
+  /** @} */
+
+  /**
+   * Get or set the value as determined by the preference tree.
+   *
+   * These methods MUST NOT fail if the preference is not set, and therefore
+   * they MUST have a default value. This default value is provided in practice
+   * by use of a default preference tree. The standard format for the pref
+   * branches are <tt>mail.server.<i>key</i>.</tt> for per-server preferences,
+   * such that the preference is <tt>mail.server.<i>key</i>.<i>attr</i></tt>.
+   *
+   * The attributes are passed in as strings for ease of access by the C++
+   * consumers of this method.
+   *
+   * There are two preference names on here for legacy reasons, where the first
+   * is the name which will be using a (preferred) relative preference and the
+   * second a deprecated absolute preference. Implementations that do not have
+   * to worry about supporting legacy preferences can safely ignore this second
+   * parameter. Callers must still provide a valid value, though.
+   *
+   * @param relpref The name of the relative file preference.
+   * @param absref  The name of the absolute file preference.
+   * @param aValue  The value of the preference to set.
+   * @return        The value of the preference.
+   * @{
+   */
+  nsIFile getFileValue(in string relpref, in string abspref);
+  void setFileValue(in string relpref, in string abspref, in nsIFile aValue);
+  /** @} */
+
+  /**
+   * this is really dangerous. this destroys all pref values
+   * do not call this unless you know what you're doing!
+   */
+  void clearAllValues();
+
+  /**
+   * This is also very dangerous. This will low-level remove the files
+   * associated with this server on disk. It does not notify any listeners.
+   */
+  void removeFiles();
+
+  attribute boolean valid;
+
+  AString toString();
+
+  /* used for comparing nsIMsgIncomingServers */
+  boolean equals(in nsIMsgIncomingServer server);
+
+  /* Get Messages at startup */
+  readonly attribute boolean downloadMessagesAtStartup;
+
+  /* check to this if the server supports filters */
+  attribute boolean canHaveFilters;
+
+  /**
+   * can this server be removed from the account manager?  for
+   * instance, local mail is not removable, but an imported folder is
+   */
+  attribute boolean canDelete;
+
+  attribute boolean loginAtStartUp;
+
+  attribute boolean limitOfflineMessageSize;
+  attribute long maxMessageSize;
+
+  attribute nsIMsgRetentionSettings retentionSettings;
+
+  /* check if this server can be a default server */
+  readonly attribute boolean canBeDefaultServer;
+
+  /* check if this server allows search operations */
+  readonly attribute boolean canSearchMessages;
+
+  /* display startup page once per account per session */
+  attribute boolean displayStartupPage;
+  attribute nsIMsgDownloadSettings downloadSettings;
+
+  /*
+   * Offline support level. Support level can vary based on abilities
+   * and features each server can offer wrt to offline service.
+   * Here is the legend to determine the each support level details
+   *
+   * supportLevel == 0  --> no offline support (default)
+   * supportLevel == 10 --> regular offline feature support
+   * supportLevel == 20 --> extended offline feature support
+   *
+   * Each server can initialize itself to the support level if needed
+   * to override the default choice i.e., no offline support.
+   *
+   * POP3, None will default to 0.
+   * IMAP level 10 and NEWS with level 20.
+   *
+   */
+  attribute long offlineSupportLevel;
+
+  /* create pretty name for migrated accounts */
+  AString generatePrettyNameForMigration();
+
+  /* does this server have disk space settings? */
+  readonly attribute boolean supportsDiskSpace;
+
+  /**
+   * Hide this server/account from the UI - used for smart mailboxes.
+   * The server can be retrieved from the account manager by name using the
+   * various Find methods, but nsIMsgAccountManager's GetAccounts and
+   * GetAllServers methods won't return the server/account.
+   */
+  attribute boolean hidden;
+
+  /**
+   * If the server supports Fcc/Sent/etc, default prefs can point to
+   * the server. Otherwise, copies and folders prefs should point to
+   * Local Folders.
+   *
+   * By default this value is set to true via global pref 'allows_specialfolders_usage'
+   * (mailnews.js). For Nntp, the value is overridden to be false.
+   * If ISPs want to modify this value, they should do that in their rdf file
+   * by using this attribute. Please look at mozilla/mailnews/base/ispdata/aol.rdf for
+   * usage example.
+   */
+  attribute boolean defaultCopiesAndFoldersPrefsToServer;
+
+  /* can this server allows sub folder creation */
+  attribute boolean canCreateFoldersOnServer;
+
+  /* can this server allows message filing ? */
+  attribute boolean canFileMessagesOnServer;
+
+  /* can this server allow compacting folders ? */
+  readonly attribute boolean canCompactFoldersOnServer;
+
+  /* can this server allow undo delete ? */
+  readonly attribute boolean canUndoDeleteOnServer;
+
+  /* used for setting up the filter UI */
+  readonly attribute nsMsgSearchScopeValue filterScope;
+
+  /* used for setting up the search UI */
+  readonly attribute nsMsgSearchScopeValue searchScope;
+
+  /**
+   * If the password for the server is available either via authentication
+   * in the current session or from password manager stored entries, return
+   * false. Otherwise, return true. If password is obtained from password
+   * manager, set the password member variable.
+   */
+  readonly attribute boolean passwordPromptRequired;
+
+  /**
+   * for mail, this configures both the MDN filter, and the server-side
+   * spam filter filters, if needed.
+   *
+   * If we have set up to filter return receipts into
+   * our Sent folder, this utility method creates
+   * a filter to do that, and adds it to our filterList
+   * if it doesn't exist.  If it does, it will enable it.
+   *
+   * this is not used by news filters (yet).
+   */
+  void configureTemporaryFilters(in nsIMsgFilterList filterList);
+
+  /**
+   * If Sent folder pref is changed we need to clear the temporary
+   * return receipt filter so that the new return receipt filter can
+   * be recreated (by ConfigureTemporaryReturnReceiptsFilter()).
+   */
+  void clearTemporaryReturnReceiptsFilter();
+
+  /**
+   * spam settings
+   */
+  readonly attribute nsISpamSettings spamSettings;
+  readonly attribute nsIMsgFilterPlugin spamFilterPlugin;
+
+  nsIMsgFolder getMsgFolderFromURI(in nsIMsgFolder aFolderResource, in AUTF8String aURI);
+
+  /// Indicates if any other server has deferred storage to this account.
+  readonly attribute boolean isDeferredTo;
+
+  const long keepDups = 0;
+  const long deleteDups = 1;
+  const long moveDupsToTrash = 2;
+  const long markDupsRead = 3;
+
+  attribute long incomingDuplicateAction;
+
+  // check if new hdr is a duplicate of a recently arrived header
+  boolean isNewHdrDuplicate(in nsIMsgDBHdr aNewHdr);
+
+  /**
+   * Set a boolean to force an inherited propertyName to return empty instead
+   * of inheriting from a parent folder, server, or the global
+   *
+   * @param propertyName         The name of the property
+   * @param aForcePropertyEmpty  true if an empty inherited property should be returned
+   */
+  void setForcePropertyEmpty(in string propertyName, in boolean aForcePropertyEmpty);
+
+  /**
+   * Get a boolean to force an inherited propertyName to return empty instead
+   * of inheriting from a parent folder, server, or the global
+   *
+   * @param propertyName      The name of the property
+   *
+   * @return                  true if an empty inherited property should be returned
+   */
+  boolean getForcePropertyEmpty(in string propertyName);
+
+  /**
+   * Return the order in which this server type should appear in the folder pane.
+   * This sort order is a number between 100000000 and 900000000 so that RDF can
+   * use it as a string.
+   * The current return values are these:
+   * 0 = default account,       100000000 = mail accounts (POP3/IMAP4),
+   * 200000000 = Local Folders, 300000000 = IM accounts,
+   * 400000000 = RSS,           500000000 = News
+   * If a new server type is created a TB UI reviewer must decide its sort order.
+   */
+  readonly attribute long sortOrder;
+};
+
+%{C++
+/*
+ * Following values for offline support have been used by
+ * various files. If you are modifying any of the values
+ * below, please do take care of the following files.
+ * - mozilla/mailnews/base/src/nsMsgAccountManagerDS.cpp
+ * - mozilla/mailnews/base/util/nsMsgIncomingServer.cpp
+ * - mozilla/mailnews/imap/src/nsImapIncomingServer.cpp
+ * - mozilla/mailnews/local/src/nsPop3IncomingServer.cpp
+ * - mozilla/mailnews/news/src/nsNntpIncomingServer.cpp
+ * - mozilla/mailnews/base/content/msgAccountCentral.js
+ * - mozilla/modules/libpref/src/init/mailnews.js
+ * - ns/modules/libpref/src/init/mailnews-ns.js
+ * - ns/mailnews/base/ispdata/aol.rdf
+ * - ns/mailnews/base/ispdata/nswebmail.rdf
+ */
+#define OFFLINE_SUPPORT_LEVEL_NONE 0
+#define OFFLINE_SUPPORT_LEVEL_REGULAR 10
+#define OFFLINE_SUPPORT_LEVEL_EXTENDED 20
+#define OFFLINE_SUPPORT_LEVEL_UNDEFINED -1
+
+// Value when no port setting is found
+#define PORT_NOT_SET -1
+
+/* some useful macros to implement nsIMsgIncomingServer accessors */
+#define NS_IMPL_SERVERPREF_STR(_class, _postfix, _prefname) \
+NS_IMETHODIMP                              \
+_class::Get##_postfix(nsACString& retval)  \
+{                                          \
+  return GetCharValue(_prefname, retval);  \
+}                                          \
+NS_IMETHODIMP                              \
+_class::Set##_postfix(const nsACString& chvalue) \
+{                                          \
+  return SetCharValue(_prefname, chvalue); \
+}
+
+#define NS_IMPL_SERVERPREF_BOOL(_class, _postfix, _prefname)\
+NS_IMETHODIMP                                               \
+_class::Get##_postfix(bool *retval)                         \
+{                                                           \
+  return GetBoolValue(_prefname, retval);                   \
+}                                                           \
+NS_IMETHODIMP                                               \
+_class::Set##_postfix(bool bvalue)                          \
+{                                                           \
+  return SetBoolValue(_prefname, bvalue);                   \
+}
+
+#define NS_IMPL_SERVERPREF_INT(_class, _postfix, _prefname)\
+NS_IMETHODIMP                                              \
+_class::Get##_postfix(int32_t *retval)                     \
+{                                                          \
+  return GetIntValue(_prefname, retval);                   \
+}                                                          \
+NS_IMETHODIMP                                              \
+_class::Set##_postfix(int32_t ivalue)                      \
+{                                                          \
+  return SetIntValue(_prefname, ivalue);                   \
+}
+
+%}
diff --git a/comm/mailnews/base/public/nsIMsgMailNewsUrl.idl b/comm/mailnews/base/public/nsIMsgMailNewsUrl.idl
new file mode 100644
index 0000000000..290760c6f0
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgMailNewsUrl.idl
@@ -0,0 +1,211 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIURL.idl"
+
+interface nsIFile;
+interface nsIUrlListener;
+interface nsIMsgStatusFeedback;
+interface nsIMsgIncomingServer;
+interface nsIMsgWindow;
+interface nsILoadGroup;
+interface nsIMsgSearchSession;
+interface nsICacheEntry;
+interface nsIMimeHeaders;
+interface nsIStreamListener;
+interface nsIMsgFolder;
+interface nsIMsgDBHdr;
+interface nsIDocShell;
+interface nsITransportSecurityInfo;
+
+[scriptable, builtinclass, uuid(995455ba-5bb4-4643-8d70-2b877a2e1320)]
+interface nsIMsgMailNewsUrl : nsIURL {
+  [noscript,notxpcom,nostdcall]
+  nsresult setFileNameInternal(in ACString aFileName);
+
+  [noscript,notxpcom,nostdcall]
+  nsresult setSpecInternal(in ACString aSpec);
+
+  [noscript,notxpcom,nostdcall]
+  nsresult setPortInternal(in long aPort);
+
+  [noscript,notxpcom,nostdcall]
+  nsresult setQueryInternal(in ACString aQuery);
+
+  [noscript,notxpcom,nostdcall]
+  nsresult setUsernameInternal(in ACString aUsername);
+
+  ///////////////////////////////////////////////////////////////////////////////
+  // Eventually we'd like to push this type of functionality up into nsIURI.
+  // The idea is to allow the "application" (the part of the code which wants to
+  // run a url in order to perform some action) to register itself as a listener
+  // on url. As a url listener, the app will be informed when the url begins to run
+  // and when the url is finished.
+  ////////////////////////////////////////////////////////////////////////////////
+  void RegisterListener(in nsIUrlListener aUrlListener);
+  void UnRegisterListener(in nsIUrlListener aUrlListener);
+
+  readonly attribute nsIURI baseURI;
+
+  // if you really want to know what the current state of the url is (running or not
+  // running) you should look into becoming a urlListener...
+  void SetUrlState(in boolean runningUrl, in nsresult aStatusCode);
+  void GetUrlState(out boolean runningUrl);
+
+  readonly attribute nsIMsgIncomingServer server;
+
+  /**
+   * Transport-level security information (if any), in the case of a security
+   * error having occurred.
+   * This value should be considered undefined if an NSS error has not
+   * occurred. Read it as: "the secInfo that was being used when a failure
+   * occurred", not: "the secInfo that failed".
+   * Seems a bit ugly adding more state here, but the idea is that a
+   * nsIUrlListener.OnStopRunningUrl() needs to be able to access a bad
+   * certificate, so as to have the option of adding an exemption (See
+   * Bug 1590473).
+   */
+  attribute nsITransportSecurityInfo failedSecInfo;
+
+  /**
+   * The folder associated with this url.
+   *
+   * @exception NS_ERROR_FAILURE    May be thrown if the url does not
+   *                                relate to a folder, e.g. standalone
+   *                                .eml messages.
+   */
+  attribute nsIMsgFolder folder;
+
+  attribute nsIMsgStatusFeedback statusFeedback;
+
+  /**
+   * The maximum progress for this URL. This might be a count, or it might
+   * be a number of bytes. A value of -1 indicates that this is unknown.
+   */
+  attribute long long maxProgress;
+
+  attribute nsIMsgWindow msgWindow;
+
+  // current mime headers if reading message
+  attribute nsIMimeHeaders mimeHeaders;
+
+  // the load group is computed from the msgWindow
+  readonly attribute nsILoadGroup loadGroup;
+
+  // search session, if we're running a search.
+  attribute nsIMsgSearchSession searchSession;
+  attribute boolean updatingFolder;
+  attribute boolean msgIsInLocalCache;
+  attribute boolean suppressErrorMsgs; // used to avoid displaying biff error messages
+
+  /**
+   * Set after an error occurred.
+   * It is not translated and contains no parameters.
+   * It is unique to each different kind of error, i.e. the same
+   * error has the same code, but a different error has a different code.
+   * This allows to recover from specific errors programmatically,
+   * or to keep error statistics.
+   * If the error comes from a server, the implementor should make
+   * efforts to pass on comparable server error identifiers and include
+   * them here, e.g. as suffixes. Example: "imap-sasl-S474", where-as "S474"
+   * comes from the server annd "imap-sasl-" is the prefix for where the
+   * server reports appears.
+   */
+  attribute ACString errorCode;
+  /**
+   * Set after an error occurred.
+   * An error message that can be displayed directly
+   * to the end user without further processing.
+   * It must have been translated.
+   * It may contain contain values as part of the message.
+   */
+  attribute AString errorMessage;
+
+  /**
+   * To be used in error situations, e.g. to give the URI to an error page
+   * that describes the problem.
+   */
+  attribute AUTF8String seeOtherURI;
+
+  attribute nsICacheEntry memCacheEntry;
+
+  const unsigned long eCopy     = 0;
+  const unsigned long eMove     = 1;
+  const unsigned long eDisplay  = 2;
+  boolean IsUrlType(in unsigned long type);
+  nsIStreamListener getSaveAsListener(in boolean addDummyEnvelope, in nsIFile aFile);
+
+  /// Returns true if the URI is for a message (e.g., imap-message://)
+  readonly attribute boolean isMessageUri;
+
+  /**
+   * Loads the URI in a docshell. This will give priority to loading the
+   * URI in the passed-in docshell. If it can't be loaded there
+   * however, the URL dispatcher will go through its normal process of content
+   * loading.
+   *
+   * @param docshell     The docshell that will consume the load.
+   *
+   * @param aLoadFlags   Flags to modify load behaviour. Flags are defined in
+   *                     nsIWebNavigation. Normally only LOAD_FLAGS_NONE or
+   *                     LOAD_FLAGS_IS_LINK is needed, but there are eleven
+   *                     other allowed sets of flags. See nsDocShellLoadTypes.h
+   */
+   void loadURI(in nsIDocShell docshell,
+                in unsigned long aLoadFlags);
+
+};
+
+//////////////////////////////////////////////////////////////////////////////////
+// This is a very small interface which I'm grouping with the mailnewsUrl interface.
+// Several url types (mailbox, imap, nntp) have similar properties because they can
+// represent mail messages. For instance, these urls can be have URI
+// equivalents which represent a message.
+// We want to provide the app the ability to get the URI for the
+// url. This URI to URL mapping doesn't exist for all mailnews urls...hence I'm
+// grouping it into a separate interface...
+//////////////////////////////////////////////////////////////////////////////////
+
+[scriptable, uuid(388a37ec-2e1a-4a4f-9d8b-189bedf1bda2)]
+interface nsIMsgMessageUrl : nsISupports {
+  // get and set the RDF URI associated with the url. Note, not all urls have
+  // had uri's set on them so be prepared to handle cases where this string is empty.
+  attribute AUTF8String uri;
+  // used by imap, pop and nntp in order to implement save message to disk
+  attribute nsIFile messageFile;
+  attribute boolean AddDummyEnvelope;
+  attribute boolean canonicalLineEnding;
+  attribute AUTF8String originalSpec;
+
+  // This is used when creating a principal for the URL with a "normalized" spec
+  // that doesn't contain all the bits in the query part that mailnews URLs have.
+  // We need this to implement nsIURIWithSpecialOrigin, since mailnews URLs
+  // have ORIGIN_IS_FULL_SPEC.
+  readonly attribute AUTF8String normalizedSpec;
+
+  /**
+   *  A message db header for that message.
+   *
+   *  @note This attribute is not guaranteed to be set, so callers that
+   *  actually require an nsIMsgDBHdr will need to use the uri attribute
+   *  on this interface to get the appropriate nsIMsgMessageService and
+   *  then get the header from there.
+   */
+  readonly attribute nsIMsgDBHdr messageHeader;
+};
+
+//////////////////////////////////////////////////////////////////////////////////
+// This is a very small interface which I'm grouping with the mailnewsUrl interface.
+// I want to isolate out all the I18N specific information that may be associated with
+// any given mailnews url. This gives I18N their own "sandbox" of routines they can add
+// and tweak as they see fit. For now it contains mostly charset information.
+//////////////////////////////////////////////////////////////////////////////////
+
+[scriptable, uuid(D71E0785-2862-11d4-98C1-001083010E9B)]
+interface nsIMsgI18NUrl : nsISupports {
+  // when true the user wants us to auto-detect the character set.
+  attribute boolean autodetectCharset;
+};
diff --git a/comm/mailnews/base/public/nsIMsgMailSession.idl b/comm/mailnews/base/public/nsIMsgMailSession.idl
new file mode 100644
index 0000000000..d11929edab
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgMailSession.idl
@@ -0,0 +1,78 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/*
+ * The mail session is a replacement for the old 4.x MSG_Master object. It
+ * contains mail session generic information such as the account manager, etc
+ * I'm starting this off as an empty interface and as people feel they need to
+ * add more information to it, they can. I think this is a better approach
+ * than trying to port over the old MSG_Master in its entirety as that had a
+ * lot of cruft in it....
+ */
+
+#include "nsIFolderListener.idl"
+
+interface nsIFile;
+interface nsIMsgWindow;
+interface nsIMsgUserFeedbackListener;
+interface nsIMsgMailNewsUrl;
+
+[scriptable, uuid(577ead34-553e-4cd6-b484-76ff6662082d)]
+interface nsIMsgMailSession : nsISupports {
+  void Shutdown();
+
+  /**
+   * Adds a listener to be notified when folders update.
+   *
+   * @param  aListener    The listener to add.
+   * @param  aNotifyFlags A combination of flags detailing on which operations
+   *                      to notify the listener. See nsIFolderListener.idl for
+   *                      details.
+   */
+  void AddFolderListener(in nsIFolderListener aListener,
+                         in folderListenerNotifyFlagValue aNotifyFlags);
+  /**
+   * Removes a listener from the folder notification list.
+   *
+   * @param  aListener    The listener to remove.
+   */
+  void RemoveFolderListener(in nsIFolderListener aListener);
+
+  /**
+   * Adds a listener to be notified of alert or prompt style feedback that
+   * should go to the user.
+   *
+   * @param  aListener    The listener to add.
+   */
+  void addUserFeedbackListener(in nsIMsgUserFeedbackListener aListener);
+
+  /**
+   * Removes a user feedback listener.
+   *
+   * @param  aListener    The listener to remove.
+   */
+  void removeUserFeedbackListener(in nsIMsgUserFeedbackListener aListener);
+
+  /**
+   * Call to alert the listeners of the message. If there are no listeners,
+   * or the listeners do not handle the alert, then this function will present
+   * the user with a modal dialog if aMsgWindow isn't null.
+   *
+   * @param aMessage    The localized message string to alert.
+   * @param aUrl        Optional mailnews url which is relevant to the operation
+   *                    which caused the alert to be generated.
+   */
+  void alertUser(in AString aMessage, [optional] in nsIMsgMailNewsUrl aUrl);
+
+  readonly attribute nsIMsgWindow topmostMsgWindow;
+  void AddMsgWindow(in nsIMsgWindow msgWindow);
+  void RemoveMsgWindow(in nsIMsgWindow msgWindow);
+  boolean IsFolderOpenInWindow(in nsIMsgFolder folder);
+
+  AUTF8String ConvertMsgURIToMsgURL(in AUTF8String aURI, in nsIMsgWindow aMsgWindow);
+  nsIFile getDataFilesDir(in string dirName);
+};
diff --git a/comm/mailnews/base/public/nsIMsgMdnGenerator.idl b/comm/mailnews/base/public/nsIMsgMdnGenerator.idl
new file mode 100644
index 0000000000..0da7475f8c
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgMdnGenerator.idl
@@ -0,0 +1,70 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+interface nsIMsgWindow;
+interface nsIMsgFolder;
+interface nsIMimeHeaders;
+
+typedef long EDisposeType;
+typedef long ReceiptHdrType;
+typedef long MDNIncorporateType;
+
+[scriptable, uuid(440EA3DE-DACA-4886-9875-84E6CD7D7927)]
+interface nsIMsgMdnGenerator : nsISupports
+{
+    const EDisposeType eDisplayed = 0;
+    const EDisposeType eDispatched = 1;
+    const EDisposeType eProcessed = 2;
+    const EDisposeType eDeleted = 3;
+    const EDisposeType eDenied = 4;
+    const EDisposeType eFailed = 5;
+
+    const ReceiptHdrType eDntType = 0;
+    const ReceiptHdrType eRrtType = 1;
+    const ReceiptHdrType eDntRrtType = 2;
+
+    const MDNIncorporateType eIncorporateInbox = 0;
+    const MDNIncorporateType eIncorporateSent = 1;
+
+    /**
+     * Prepare the sending of a mdn reply, and checks the prefs whether a
+     * reply should be send. Might send the message automatically if the
+     * prefs say it should.
+     * @param eType   One of EDisposeType above, indicating the action that led
+     *                to sending the mdn reply
+     * @param aWindow The window the message was displayed in, acting as parent
+     *                for any (error) dialogs
+     * @param folder  The folder the message is in
+     * @param key     the message key
+     * @param headers the message headers
+     * @param autoAction  true if the request action led to sending the mdn
+     *                reply was an automatic action, false if it was user initiated
+     * @returns true if the user needs to be asked for permission
+     *          false in other cases (whether the message was sent or denied)
+     */
+    boolean process(in EDisposeType eType, in nsIMsgWindow aWindow,
+                    in nsIMsgFolder folder, in nsMsgKey key,
+                    in nsIMimeHeaders headers, in boolean autoAction);
+
+    /**
+     * Must be called when the user was asked for permission and agreed to
+     * sending the mdn reply.
+     * May only be called when |process| returned |true|. Behaviour is
+     * unspecified in other cases
+     */
+    void userAgreed();
+
+    /**
+     * Must be called when the user was asked for permission and declined to
+     * send the mdn reply.
+     * Will mark the message so that the user won't be asked next time.
+     * May only be called when |process| returned |true|. Behaviour is
+     * unspecified in other cases.
+     */
+    void userDeclined();
+};
diff --git a/comm/mailnews/base/public/nsIMsgMessageService.idl b/comm/mailnews/base/public/nsIMsgMessageService.idl
new file mode 100644
index 0000000000..93d9902e63
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgMessageService.idl
@@ -0,0 +1,226 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+interface nsIURI;
+interface nsIUrlListener;
+interface nsIStreamListener;
+interface nsIMsgWindow;
+interface nsIFile;
+interface nsIMsgFolder;
+interface nsIMsgSearchSession;
+interface nsIMsgDBHdr;
+interface nsIStreamConverter;
+interface nsICacheEntry;
+
+%{C++
+#include "MailNewsTypes.h"
+%}
+
+/**
+ * nsIMsgMessageService provides higher-level, UI-oriented calls for
+ * dealing with messages in a protocol-agnostic way.
+ * Things the user would recognise as actions they initiated.
+ * This covers things like displaying messages, copying them, saving them
+ * to disk, saving attachments...
+ */
+[scriptable, uuid(3aa7080a-73ac-4394-9636-fc00e182319b)]
+interface nsIMsgMessageService : nsISupports {
+
+  /**
+   * If you want a handle on the running task, pass in a valid nsIURI
+   * ptr. You can later interrupt this action by asking the netlib
+   * service manager to interrupt the url you are given back.
+   * Remember to release aURL when you are done with it. Pass nullptr
+   * in for aURL if you don't care about the returned URL.
+   */
+
+  /**
+   * Pass in the URI for the message you want to have copied.
+   *
+   * @param aSrcURI
+   * @param aCopyListener already knows about the destination folder.
+   * @param aMoveMessage TRUE if you want the message to be moved.
+   *                     FALSE leaves it as just a copy.
+   * @param aUrlListener
+   * @param aMsgWindow
+   */
+  void copyMessage(in AUTF8String aSrcURI, in nsIStreamListener aCopyListener, in boolean aMoveMessage,
+               in nsIUrlListener aUrlListener, in nsIMsgWindow aMsgWindow);
+
+  /**
+   * Copy multiple messages at a time
+   *
+   * @param keys
+   * @param srcFolder
+   * @param aCopyListener
+   * @param aMoveMessage
+   * @param aUrlListener
+   * @param aMsgWindow
+   * @returns URI that's run to perform the copy
+   */
+  nsIURI CopyMessages(in Array<nsMsgKey> aKeys,
+                      in nsIMsgFolder srcFolder,
+                      in nsIStreamListener aCopyListener,
+                      in boolean aMoveMessage,
+                      in nsIUrlListener aUrlListener,
+                      in nsIMsgWindow aMsgWindow);
+
+  /**
+   * When you want a message displayed.... this loads it into the consumer.
+   *
+   * @param aMessageURI Is a uri representing the message to display.
+   * @param aDisplayConsumer Is (for now) an nsIDocShell which we'll use to load
+   *                         the message into.
+   *                         XXXbz Should it be an nsIWebNavigation or something?
+   * @param aMsgWindow
+   * @param aUrlListener
+   * @param aAutodetectCharset (optional) if the characterset should be auto-detected.
+   */
+  void loadMessage(in AUTF8String aMessageURI,
+            in nsISupports aDisplayConsumer,
+            in nsIMsgWindow aMsgWindow,
+            in nsIUrlListener aUrlListener,
+            in boolean aAutodetectCharset);
+
+  /**
+   * When you want to spool a message out to a file on disk.
+   * This is an asynch operation of course. You must pass in a
+   * url listener in order to figure out when the operation is done.
+   *
+   * @param aMessageURI The uri representing the message to spool out to disk.
+   * @param aFile The file you want the message saved to
+   * @param aGenerateDummyEnvelope Usually FALSE. Set to TRUE if you want the msg
+   *        appended at the end of the file.
+   * @param aUrlListener
+   * @param aURL
+   * @param canonicalLineEnding
+   * @param aMsgWindow
+   */
+  void SaveMessageToDisk(in AUTF8String aMessageURI, in nsIFile aFile,
+                         in boolean aGenerateDummyEnvelope,
+                         in nsIUrlListener aUrlListener, out nsIURI aURL,
+                         in boolean canonicalLineEnding, in nsIMsgWindow aMsgWindow);
+
+  /**
+   * When you have a uri and you would like to convert that
+   * to a url which can be run through necko, you can use this method.
+   * the Uri MUST refer to a message and not a folder!
+   *
+   * @param aMessageURI A message uri to convert.
+   * @param aMsgWindow
+   *
+   * @return a URL which can be run through necko
+   */
+  nsIURI getUrlForUri(in AUTF8String aMessageURI, [optional] in nsIMsgWindow aMsgWindow);
+
+  /**
+   *
+   *
+   * @param aSearchSession
+   * @param aMsgWindow
+   * @param aMsgFolder
+   * @param aSearchUri
+   */
+  void Search(in nsIMsgSearchSession aSearchSession, in nsIMsgWindow aMsgWindow, in nsIMsgFolder aMsgFolder, in AUTF8String aSearchUri);
+
+  /**
+   * This method streams a message to the passed in consumer. If aConvertData is true, it
+   * will create a stream converter from message rfc822 to star/star. It will also tack
+   * aAdditionalHeader onto the url (e.g., "header=filter").
+   *
+   * @param aMessageURI  uri of message to stream
+   * @param aConsumer    generally, a stream listener listening to the message
+   * @param aMsgWindow   msgWindow for give progress and status feedback
+   * @param aUrlListener gets notified when url starts and stops
+   * @param aConvertData should we create a stream converter?
+   * @param aAdditionalHeader added to URI, e.g., "header=filter"
+   * @param aLocalOnly whether data should be retrieved only from local caches
+   *        If streaming over the network is required and this is true, then
+   *        an exception is thrown. This defaults to false.
+   *
+   * @note If we're offline, then even if aLocalOnly is false, we won't stream over the
+   *       network
+   *
+   * @return the URL that gets run
+   */
+  nsIURI streamMessage(in AUTF8String aMessageURI, in nsISupports aConsumer,
+                    in nsIMsgWindow aMsgWindow,
+                    in nsIUrlListener aUrlListener,
+                    in boolean aConvertData,
+                    in ACString aAdditionalHeader,
+                    [optional] in boolean aLocalOnly);
+
+  /**
+   * This method streams a message's headers to the passed in consumer.
+   * This is for consumers who want a particular header but don't
+   * want to stream the whole message.
+   *
+   * @param aMessageURI  uri of message whose headers we are to stream
+   * @param aConsumer    a stream listener listening to the message
+                         headers.
+   * @param aUrlListener gets notified when url starts and stops, if we run a url.
+   * @param aLocalOnly whether data should be retrieved only from local caches
+   *        If streaming over the network is required and this is true, then
+   *        an exception is thrown. This defaults to false.
+   *
+   * @note If we're offline, then even if aLocalOnly is false, we won't stream over the
+   *       network
+   *
+   * @return the URL that gets run, if any.
+   */
+  nsIURI streamHeaders(in AUTF8String aMessageURI, in nsIStreamListener aConsumer,
+                       in nsIUrlListener aUrlListener,
+                       [optional] in boolean aLocalOnly);
+
+  /**
+   * Determines whether a message is in the memory cache. Local folders
+   * don't implement this.
+   * The URL needs to address a message, not a message part, all query
+   * qualifiers will be stripped before looking up the entry in the cache.
+   *
+   * @param aUrl The URL of the message, possibly with an appropriate command in it
+   * @param aFolder The folder this message is in
+   *
+   * @return TRUE if the message is in mem cache; FALSE if it is not.
+   */
+  boolean isMsgInMemCache(in nsIURI aUrl,
+                          in nsIMsgFolder aFolder);
+
+  /**
+   * now the the message datasource is going away
+   * we need away to go from message uri to go nsIMsgDBHdr
+   *
+   * @param uri A message uri to get nsIMsgDBHdr for.
+   *
+   * @return nsIMsgDBHdr for specified uri or null if failed.
+   */
+  nsIMsgDBHdr messageURIToMsgHdr(in AUTF8String uri);
+};
+
+/**
+ * Some mail protocols (like imap) allow you to fetch individual mime parts. We use this interface
+ * to represent message services whose protocols support this. To use this interface, you should get
+ * the message service then QI for this interface. If it's present, then can fetch a mime part.
+ */
+[scriptable, uuid(3728C255-480C-11d4-98D0-001083010E9B)]
+interface nsIMsgMessageFetchPartService : nsISupports
+{
+  /**
+   * Used to fetch an individual mime part
+   *
+   * @param aURI url representing the message
+   * @param aMessageURI RDF URI including the part to fetch
+   * @param aDisplayConsumer
+   * @param aMsgWindow
+   * @param aUrlListener
+   *
+   * @return
+   */
+  nsIURI fetchMimePart(in nsIURI aURI, in AUTF8String aMessageUri, in nsISupports aDisplayConsumer,
+            in nsIMsgWindow aMsgWindow,
+            in nsIUrlListener aUrlListener);
+};
diff --git a/comm/mailnews/base/public/nsIMsgOfflineManager.idl b/comm/mailnews/base/public/nsIMsgOfflineManager.idl
new file mode 100644
index 0000000000..282af2d2b5
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgOfflineManager.idl
@@ -0,0 +1,22 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+// this is a service -there's only one Offline Manager, because you can only do one operation at a time
+// (go online or offline).
+
+interface nsIMsgWindow;
+
+[scriptable, uuid(5e885fec-09b0-11d5-a5bf-0060b0fc04b7)]
+interface nsIMsgOfflineManager : nsISupports
+{
+  attribute nsIMsgWindow window; // should be a progress window.
+  attribute boolean inProgress;  // an online->offine or online->offline operation in progress.
+                                 // the offline menu should be disabled.
+  void goOnline(in boolean sendUnsentMessages, in boolean playbackOfflineImapOperations, in nsIMsgWindow aMsgWindow);
+  void synchronizeForOffline(in boolean downloadNews, in boolean downloadMail, in boolean sendUnsentMessages,
+                            in boolean goOfflineWhenDone, in nsIMsgWindow aMsgWindow);
+};
diff --git a/comm/mailnews/base/public/nsIMsgPluggableStore.idl b/comm/mailnews/base/public/nsIMsgPluggableStore.idl
new file mode 100644
index 0000000000..5273d6f0a6
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgPluggableStore.idl
@@ -0,0 +1,335 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgFolder;
+interface nsIMsgCopyServiceListener;
+interface nsIMsgDBHdr;
+interface nsIMsgWindow;
+interface nsIOutputStream;
+interface nsIInputStream;
+interface nsIUrlListener;
+interface nsIMsgDatabase;
+interface nsITransaction;
+
+[scriptable, uuid(F732CE58-E540-4dc4-B803-9456056EBEFC)]
+
+/**
+ * Pluggable message store interface. Each incoming server can have a different
+ * message store.
+ * All methods are synchronous unless otherwise specified.
+ */
+interface nsIMsgPluggableStore : nsISupports {
+  /**
+   * Examines the store and adds subfolders for the existing folders in the
+   * profile directory. aParentFolder->AddSubfolder is the normal way
+   * to register the subfolders. This method is expected to be synchronous.
+   * This shouldn't be confused with server folder discovery, which is allowed
+   * to be asynchronous.
+   *
+   * @param aParentFolder folder whose existing children we want to discover.
+   *                      This will be the root folder for the server object.
+   * @param aDeep true if we should discover all descendents. Would we ever
+   *              not want to do this?
+   */
+
+  void discoverSubFolders(in nsIMsgFolder aParentFolder, in boolean aDeep);
+  /**
+   * Creates storage for a new, empty folder.
+   *
+   * @param aParent parent folder
+   * @param aFolderName leaf name of folder.
+   * @return newly created folder.
+   * @exception NS_MSG_FOLDER_EXISTS If the child exists.
+   * @exception NS_MSG_CANT_CREATE_FOLDER for other errors.
+   */
+  nsIMsgFolder createFolder(in nsIMsgFolder aParent, in AString aFolderName);
+
+  /**
+   * Delete storage for a folder and its subfolders, if any.
+   * This is a real delete, not a move to the trash folder.
+   *
+   * @param aFolder folder to delete
+   */
+  void deleteFolder(in nsIMsgFolder aFolder);
+
+  /**
+   * Rename storage for an existing folder.
+   *
+   * @param aFolder folder to rename
+   * @param aNewName name to give new folder
+   * @return the renamed folder object
+   */
+  nsIMsgFolder renameFolder(in nsIMsgFolder aFolder, in AString aNewName);
+
+  /**
+   * Tells if the store has the requested amount of space available in the
+   * specified folder.
+   *
+   * @param aFolder folder we want to add messages to.
+   * @param aSpaceRequested How many bytes we're trying to add to the store.
+   *
+   * The function returns an exception if there is not enough space to
+   * indicate the reason of the shortage:
+   * NS_ERROR_FILE_TOO_BIG   = the store cannot grow further due to internal limits
+   * NS_ERROR_FILE_NO_DEVICE_SPACE = there is not enough space on the disk
+   */
+  boolean hasSpaceAvailable(in nsIMsgFolder aFolder,
+                            in long long aSpaceRequested);
+
+  /**
+   * Move/Copy a folder to a new parent folder. This method is asynchronous.
+   * The store needs to use the aListener to notify the core code of the
+   * completion of the operation. And it must send the appropriate
+   * nsIMsgFolderNotificationService notifications.
+   *
+   * @param aSrcFolder folder to move/copy
+   * @param aDstFolder parent dest folder
+   * @param aIsMoveFolder true if move, false if copy. If move, source folder
+   *                      is deleted when copy completes.
+   * @param aMsgWindow used to display progress, may be null
+   * @param aListener - used to get notification when copy is done.
+   * @param aNewName  Optional new name for the target folder.
+   *                  If rename is not needed, set this to empty string.
+   */
+  void copyFolder(in nsIMsgFolder aSrcFolder, in nsIMsgFolder aDstFolder,
+                  in boolean aIsMoveFolder, in nsIMsgWindow aMsgWindow,
+                  in nsIMsgCopyServiceListener aListener,
+                  in AString aNewName);
+
+  /**
+   * Get an output stream for a message in a folder.
+   *
+   * @param aFolder folder to create a message output stream for.
+   * @param aNewHdr If aNewHdr is set on input, then this is probably for
+   *                offline storage of an existing message. If null, the
+   *                this is a newly downloaded message and the store needs
+   *                to create a new header for the new message. If the db
+   *                is invalid, this can be null. But if the db is valid,
+   *                the store should create a message header with the right
+   *                message key, or whatever other property it needs to set to
+   *                be able to retrieve the message contents later. If the store
+   *                needs to base any of this on the contents of the message,
+   *                it will need remember the message header and hook into
+   *                the output stream somehow to alter the message header.
+   *
+   * @return The output stream to write to. The output stream will be positioned
+   *         for writing (e.g., for berkeley mailbox, it will be at the end).
+   */
+  nsIOutputStream getNewMsgOutputStream(in nsIMsgFolder aFolder,
+                                        inout nsIMsgDBHdr aNewHdr);
+
+
+  /**
+   * Called when the current message is discarded, e.g., it is moved
+   * to an other folder as a filter action, or is deleted because it's
+   * a duplicate. This gives the berkeley mailbox store a chance to simply
+   * truncate the Inbox w/o leaving a deleted message in the store.
+   *
+   * discardNewMessage closes aOutputStream always unless the passed stream
+   * is nullptr due to error processing..
+   * (Clarification/Rationale in Bug 1121842, 1122698, 1242030)
+   *
+   * @param aOutputStream stream we were writing the message to be discarded to
+   * @param aNewHdr header of message to discard
+   */
+  void discardNewMessage(in nsIOutputStream aOutputStream,
+                         in nsIMsgDBHdr aNewHdr);
+
+  /**
+   * Must be called by code that calls getNewMsgOutputStream to finish
+   * the process of storing a new message, if the new msg has not been
+   * discarded. Could/should this be combined with discardNewMessage?
+   *
+   * finishNewMessage closes aOutputStream always unless the passed stream
+   * is nullptr due to error processing.
+   * (Clarification/Rationale in Bug 1121842, 1122698, 1242030)
+   *
+   * @param aOutputStream stream we were writing the message to.
+   * @param aNewHdr header of message finished.
+   */
+  void finishNewMessage(in nsIOutputStream aOutputStream,
+                        in nsIMsgDBHdr aNewHdr);
+
+  /**
+   * Called by pop3 message filters when a newly downloaded message is being
+   * moved by an incoming filter. This is called before finishNewMessage, and
+   * it allows the store to optimize that case.
+   *
+   * @param aNewHdr msg hdr of message being moved.
+   * @param aDestFolder folder to move message to, in the same store.
+   *
+   * @return true if successful, false if the store doesn't want to optimize
+   *         this.
+   * @exception If the moved failed. values TBD
+   */
+  boolean moveNewlyDownloadedMessage(in nsIMsgDBHdr aNewHdr,
+                                     in nsIMsgFolder aDestFolder);
+
+  /**
+   * Get an input stream that we can read the contents of a message from.
+   *
+   * @param aMsgFolder Folder containing the message
+   * @param aMsgToken token that identifies message. This is store-dependent,
+   *                  and must be set as a string property "storeToken" on the
+   *                  message hdr by the store when the message is added
+   *                  to the store.
+   */
+  nsIInputStream getMsgInputStream(in nsIMsgFolder aFolder,
+                                   in ACString aMsgToken);
+
+  /**
+   * This is a hack to expose to allow JsAccount folders to implement a
+   * working getLocalMsgStream().
+   * It just provides a way to construct a SlicedInputStream from JS.
+   * It'll be removed once Bug 1733849 is complete.
+   *
+   * @param inStream The stream providing the data to be sliced.
+   *                 Should not be read after calling this function.
+   * @param start Where slice begins, from current position of inStream.
+   * @param length The size of the slice.
+   *
+   * @return A new input stream which produces the data slice when read from.
+   */
+  nsIInputStream sliceStream(in nsIInputStream inStream,
+                             in unsigned long long start,
+                             in unsigned long length);
+
+  /**
+   * Delete the passed in messages. These message should all be in the
+   * same folder.
+   * @param aHdrArray array of nsIMsgDBHdr's.
+   */
+  void deleteMessages(in Array<nsIMsgDBHdr> aHdrArray);
+
+  /**
+   * This allows the store to handle a msg move/copy if it wants. This lets
+   * it optimize move/copies within the same store. E.g., for maildir, a
+   * msg move mostly entails moving the file containing the message, and
+   * updating the db.
+   * If the store does the copy, it must return the appropriate undo action,
+   * which can be store dependent. And it must send the appropriate
+   * nsIMsgFolderNotificationService notifications.
+   * If the store does not perform the copy, it returns false and the caller
+   * has to handle the copy itself (by streaming messages).
+   * This function is synchronous.
+   *
+   * @param isMove true if this is a move, false if it is a copy.
+   * @param aHdrArray array of nsIMsgDBHdr's, all in the same folder
+   * @param aDstFolder folder to move/copy the messages to.
+   * @param aDstHdrs array of nsIMsgDBHdr's in the destination folder.
+   * @param[out,optional] aUndoAction transaction to provide undo, if
+   * the store does the copy itself.
+   * @return true if messages were copied, false if the core code should
+   *         do the copy.
+   */
+  boolean copyMessages(in boolean isMove,
+                       in Array<nsIMsgDBHdr> aHdrArray,
+                       in nsIMsgFolder aDstFolder,
+                       out Array<nsIMsgDBHdr> aDstHdrs,
+                       out nsITransaction aUndoAction);
+
+  /**
+   * Does this store require compaction? For example, maildir doesn't require
+   * compaction at all. Berkeley mailbox does. A sqlite store probably doesn't.
+   * This is a static property of the store. It doesn't mean that any particular
+   * folder has space that can be reclaimed via compaction. Right now, the core
+   * code keeps track of the size of messages deleted, which it can use in
+   * conjunction with this store attribute.
+   */
+  readonly attribute boolean supportsCompaction;
+
+  /**
+   * Remove deleted messages from the store, reclaiming space. Some stores
+   * won't need to do anything here (e.g., maildir), and those stores
+   * should return false for needsCompaction. This operation is asynchronous,
+   * and the passed url listener should be called when the operation is done.
+   *
+   * @param aFolder folder whose storage is to be compacted
+   * @param aListener listener notified when compaction is done.
+   * @param aMsgWindow window to display progress/status in.
+   */
+  void compactFolder(in nsIMsgFolder aFolder, in nsIUrlListener aListener,
+                     in nsIMsgWindow aMsgWindow);
+
+  /**
+   * Is the summary file for the passed folder valid? For Berkeley Mailboxes,
+   * for local mail folders, this checks the timestamp and size of the local
+   * mail folder against values stored in the db. For other stores, this may
+   * be a noop, though other stores could certainly become invalid. For
+   * Berkeley Mailboxes, this is to deal with the case of other apps altering
+   * mailboxes from outside mailnews code, and this is certainly possible
+   * with other stores.
+   *
+   * @param aFolder Folder to check if summary is valid for.
+   * @param aDB DB to check validity of.
+   *
+   * @return return true if the summary file is valid, false otherwise.
+   */
+  boolean isSummaryFileValid(in nsIMsgFolder aFolder, in nsIMsgDatabase aDB);
+
+  /**
+   * Marks the summary file for aFolder as valid or invalid. This method
+   * may not be required, since it's really used by Berkeley Mailbox code
+   * to fix the timestamp and size for a folder.
+   *
+   * @param aFolder folder whose summary file should be marked (in)valid.
+   * @param aDB db to mark valid (may not be the folder's db in odd cases
+   *            like folder compaction.
+   * @param aValid whether to mark it valid or invalid.
+   */
+  void setSummaryFileValid(in nsIMsgFolder aFolder, in nsIMsgDatabase aDB,
+                           in boolean aValid);
+
+  /**
+   * Rebuild the index from information in the store. This involves creating
+   * a new nsIMsgDatabase for the folder, adding the information for all the
+   * messages in the store, and then copying the new msg database over the
+   * existing database. For Berkeley mailbox, we try to maintain meta data
+   * stored in the existing database when possible, and other stores should do
+   * the same. Ideally, I would figure out a way of making that easy. That
+   * might entail reworking the rebuild index process into one where the store
+   * would iterate over the messages, and stream each message through the
+   * message parser, and the common code would handle maintaining the
+   * meta data. But the berkeley mailbox code needs to do some parsing because
+   * it doesn't know how big the message is (i.e., the stream can't simply be
+   * a file stream).
+   * This operation is asynchronous,
+   * and the passed url listener should be called when the operation is done.
+   *
+   * @param aFolder folder whose storage is to be compacted
+   * @param aMsgDB db to put parsed headers in.
+   * @param aMsgWindow msgWindow to use for progress updates.
+   * @param aListener listener notified when the index is rebuilt.
+   */
+  void rebuildIndex(in nsIMsgFolder aFolder, in nsIMsgDatabase aMsgDB,
+                    in nsIMsgWindow aMsgWindow, in nsIUrlListener aListener);
+
+  /**
+   * Sets/Clears the passed flags on the passed messages.
+   * @param aHdrArray array of nsIMsgDBHdr's
+   * @param aFlags flags to set/clear
+   * @param aSet true to set the flag(s), false to clear.
+   */
+  void changeFlags(in Array<nsIMsgDBHdr> aHdrArray, in unsigned long aFlags,
+                   in boolean aSet);
+  /**
+   *Sets/Clears the passed keywords on the passed messages.
+   * @param aHdrArray array of nsIMsgDBHdr's
+   * @param aKeywords keywords to set/clear
+   * @param aAdd true to add the keyword(s), false to remove.
+   */
+  void changeKeywords(in Array<nsIMsgDBHdr> aHdrArray, in ACString aKeywords,
+                      in boolean aAdd);
+
+  /**
+   * Identifies a specific type of store. Please use this only for legacy
+   * bug fixes, and not as a method to change behavior!
+   *
+   * Typical values: "mbox", "maildir"
+   */
+  readonly attribute ACString storeType;
+};
diff --git a/comm/mailnews/base/public/nsIMsgProgress.idl b/comm/mailnews/base/public/nsIMsgProgress.idl
new file mode 100644
index 0000000000..4e370d090c
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgProgress.idl
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "nsISupports.idl"
+#include "domstubs.idl"
+#include "nsIPrompt.idl"
+#include "nsIWebProgressListener.idl"
+
+interface mozIDOMWindowProxy;
+interface nsIMsgWindow;
+
+[scriptable, uuid(6d6fe91d-7f9a-4552-9737-9f74b0e75538)]
+interface nsIMsgProgress: nsIWebProgressListener {
+
+  /**
+   * Open the progress dialog, you can specify parameters through an xpcom object
+   */
+  void openProgressDialog(in mozIDOMWindowProxy parent,
+                          in nsIMsgWindow aMsgWindow,
+                          in string dialogURL,
+                          in boolean inDisplayModal,
+                          in nsISupports parameters);
+
+  /* Close the progress dialog */
+  void closeProgressDialog(in boolean forceClose);
+
+  /* Register a Web Progress Listener */
+  void registerListener(in nsIWebProgressListener listener);
+
+  /* Unregister a Web Progress Listener */
+  void unregisterListener(in nsIWebProgressListener listener);
+
+  /* Indicated if the user asked to cancel the current process */
+  attribute boolean processCanceledByUser;
+
+  attribute nsIMsgWindow msgWindow;
+};
diff --git a/comm/mailnews/base/public/nsIMsgProtocolHandler.idl b/comm/mailnews/base/public/nsIMsgProtocolHandler.idl
new file mode 100644
index 0000000000..a526104676
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgProtocolHandler.idl
@@ -0,0 +1,13 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIURI;
+
+[scriptable, uuid(4e9e4a43-343a-4309-a88b-08c5f37f5965)]
+interface nsIMsgProtocolHandler : nsISupports {
+  nsIURI newURI(in AUTF8String aSpec, in string aOriginCharset, in nsIURI aBaseURI);
+};
diff --git a/comm/mailnews/base/public/nsIMsgProtocolInfo.idl b/comm/mailnews/base/public/nsIMsgProtocolInfo.idl
new file mode 100644
index 0000000000..7a505673e0
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgProtocolInfo.idl
@@ -0,0 +1,97 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIFile;
+
+%{C++
+#define NS_MSGPROTOCOLINFO_CONTRACTID_PREFIX \
+  "@mozilla.org/messenger/protocol/info;1?type="
+%}
+
+[scriptable, uuid(9428b5f5-8b12-493c-aae2-18296c2877b1)]
+interface nsIMsgProtocolInfo : nsISupports
+{
+    /**
+     * the default path to store local data for this type of
+     * server. Each server is usually in a subdirectory below this
+     */
+    attribute nsIFile defaultLocalPath;
+
+    /**
+     * the IID of the protocol-specific interface for this server
+     * usually used from JS to dynamically get server-specific attributes
+     */
+    readonly attribute nsIIDPtr serverIID;
+
+    /**
+     * does this server type require a username?
+     * for instance, news does not but IMAP/POP do
+     */
+    readonly attribute boolean requiresUsername;
+
+    /**
+     * if the pretty name of the server should
+     * just be the e-mail address. Otherwise it usually
+     * ends up being something like "news on hostname"
+     */
+    readonly attribute boolean preflightPrettyNameWithEmailAddress;
+
+    /**
+     * can this type of server be removed from the account manager?
+     * for instance, local mail is not removable
+     */
+    readonly attribute boolean canDelete;
+
+    /**
+     * can this type of server log in at startup?
+     */
+    readonly attribute boolean canLoginAtStartUp;
+
+    /**
+     * can you duplicate this server?
+     * for instance, local mail is unique and should not be duplicated.
+     */
+    readonly attribute boolean canDuplicate;
+
+    /* the default port
+       This is similar to nsIProtocolHanderl.defaultPort,
+       but for architectural reasons, there is a mail-specific interface to this.
+       When the input param isSecure is set to true, for all supported protocols,
+       the secure port value is returned. If isSecure is set to false the default
+       port value is returned  */
+    long getDefaultServerPort(in boolean isSecure);
+
+    /**
+     * An attribute that tell us whether on not we can
+     * get messages for the given server type
+   * this is poorly named right now.
+   * it's really is there an inbox for this type?
+   * XXX todo, rename this.
+     */
+    readonly attribute boolean canGetMessages;
+
+    /**
+   * do messages arrive for this server
+   * if they do, we can use our junk controls on it.
+   */
+    readonly attribute boolean canGetIncomingMessages;
+
+    /**
+     * do biff by default?
+     */
+    readonly attribute boolean defaultDoBiff;
+
+    /**
+     * do we need to show compose message link in the AccountCentral page ?
+     */
+    readonly attribute boolean showComposeMsgLink;
+
+    /**
+     * Will new folders be created asynchronously?
+     */
+    readonly attribute boolean foldersCreatedAsync;
+};
diff --git a/comm/mailnews/base/public/nsIMsgPurgeService.idl b/comm/mailnews/base/public/nsIMsgPurgeService.idl
new file mode 100644
index 0000000000..a914d41525
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgPurgeService.idl
@@ -0,0 +1,13 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(c73294b2-b619-4915-b0e8-314d4215e08d)]
+interface nsIMsgPurgeService : nsISupports {
+
+  void init();
+  void shutdown();
+};
diff --git a/comm/mailnews/base/public/nsIMsgShutdown.idl b/comm/mailnews/base/public/nsIMsgShutdown.idl
new file mode 100644
index 0000000000..419e5219a5
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgShutdown.idl
@@ -0,0 +1,67 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+interface nsIUrlListener;
+interface nsIMsgWindow;
+interface nsIWebProgressListener;
+
+[scriptable, uuid(D1B43428-B631-4629-B691-AB0E01A2DB4B)]
+interface nsIMsgShutdownTask : nsISupports
+{
+  /**
+   * Inform the caller whether or not the task needs to be run. This method
+   * gives the task the flexibility to cancel running a task on shutdown
+   * if nothing needs to be run.
+   */
+  readonly attribute boolean needsToRunTask;
+
+  /**
+   * At shutdown-time, this function will be called to all registered implementors.
+   * Shutdown will be temporarily postponed until |OnStopRequest()| has been called
+   * on the passed in url-listener.
+   * @param inUrlListener The URL listener to report events to.
+   * @param inMsgWindow The current message window to allow for posing dialogs.
+   * @return If the shutdown URL was run or not. If the URL is running, the task
+   *         will be responsible for notifying |inUrlListener| when the task is completed.
+   */
+  boolean doShutdownTask(in nsIUrlListener inUrlListener, in nsIMsgWindow inMsgWindow);
+
+  /**
+   * Get the displayable name of the current task. This textual information will be
+   * shown to the user so they know what shutdown task is being performed.
+   * @return The name of the current task being performed.
+   */
+  AString getCurrentTaskName();
+};
+
+[scriptable, uuid(483C8ABB-ECF9-48A3-A394-2C604B603BD5)]
+interface nsIMsgShutdownService : nsISupports
+{
+  /**
+   * Get the number of tasks that will need to be processed at shutdown time.
+   * @return The number of shutdown tasks to do.
+   */
+  long getNumTasks();
+
+  /**
+   * Start the shutdown tasks.
+   */
+  void startShutdownTasks();
+
+  /**
+   * Tell the service to stop running tasks and go ahead and shutdown the application.
+   */
+  void cancelShutdownTasks();
+
+  /**
+   * Set the shutdown listener.
+   */
+  void setShutdownListener(in nsIWebProgressListener inListener);
+
+  /**
+   * Set the status text of the shutdown progress dialog.
+   */
+  void setStatusText(in AString inStatusString);
+};
diff --git a/comm/mailnews/base/public/nsIMsgStatusFeedback.idl b/comm/mailnews/base/public/nsIMsgStatusFeedback.idl
new file mode 100644
index 0000000000..2aedd4713b
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgStatusFeedback.idl
@@ -0,0 +1,18 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(AACBFA34-8D29-4A08-9283-A8E5B3AB067F)]
+interface nsIMsgStatusFeedback : nsISupports {
+  void showStatusString(in AString aStatus);
+  void startMeteors();
+  void stopMeteors();
+  void showProgress(in long aPercent);
+  void setStatusString(in AString aStatus); // will be displayed until next user action
+
+  /* aStatusFeedback: a wrapped JS status feedback object */
+  void setWrappedStatusFeedback(in nsIMsgStatusFeedback aStatusFeedback);
+};
diff --git a/comm/mailnews/base/public/nsIMsgTagService.idl b/comm/mailnews/base/public/nsIMsgTagService.idl
new file mode 100644
index 0000000000..0317b64960
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgTagService.idl
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/*
+ * Keys are the internal representation of tags, and use a limited range of
+ * characters, basically the characters allowed in imap keywords, which are
+ * alphanumeric characters, but don't include spaces. Keys are stored on
+ * the imap server, in local mail messages, and in summary files.
+ *
+ * Tags are the user visible representation of keys, and are full unicode
+ * strings. Tags should allow any unicode character.
+ *
+ * This service will do the mapping between keys and tags. When a tag
+ * is added, we'll need to "compute" the corresponding key to use. This
+ * will probably entail replacing illegal ascii characters (' ', '/', etc)
+ * with '_' and then converting to imap mod utf7. We'll then need to make
+ * sure that no other keyword has the same value since that algorithm
+ * doesn't guarantee a unique mapping.
+ *
+ * Tags are sorted internally by 'importance' by their ordinal strings (which by
+ * default are equal to a tag's key and thus only stored if different).
+ * The alphanumerically 'smallest' string is called the 'most important' one and
+ * comes first in any sorted array. The remainder follows in ascending order.
+ */
+
+[scriptable, uuid(84d593a3-5d8a-45e6-96e2-9189acd422e1)]
+interface nsIMsgTag : nsISupports {
+  readonly attribute ACString key;     // distinct tag identifier
+  readonly attribute AString  tag;     // human readable tag name
+  readonly attribute ACString color;   // tag color
+  readonly attribute ACString ordinal; // custom sort string (usually empty)
+};
+
+[scriptable, uuid(97360ce3-0fba-4f1c-8214-af7bdc6f8587)]
+interface nsIMsgTagService : nsISupports {
+  // create new tag by deriving the key from the tag
+  void addTag(in AString tag, in ACString color, in ACString ordinal);
+  // create/update tag with known key
+  void addTagForKey(in ACString key, in AString tag, in ACString color, in ACString ordinal);
+  // get the key representation of a given tag
+  ACString getKeyForTag(in AString tag);
+  // get the first key by ordinal order
+  ACString getTopKey(in ACString keyList);
+  // support functions for single tag aspects
+  AString getTagForKey(in ACString key); // look up the tag for a key.
+  void setTagForKey(in ACString key, in AString tag); // this can be used to "rename" a tag
+  ACString getColorForKey(in ACString key);
+  AString getSelectorForKey(in ACString key);  // return wide string to avoid conversion
+  void setColorForKey(in ACString key, in ACString color);
+  ACString getOrdinalForKey(in ACString key);
+  void setOrdinalForKey(in ACString key, in ACString ordinal);
+  // delete a tag from the list of known tags (but not from any messages)
+  void deleteKey(in ACString key);
+  // get all known tags
+  Array<nsIMsgTag> getAllTags();
+  /*
+   * Determines if the token in aKey corresponds to a current valid tag
+   *
+   * @param aKey        The string to test
+   * @return            True if aKey is a current token
+   */
+  boolean isValidKey(in ACString aKey);
+};
diff --git a/comm/mailnews/base/public/nsIMsgThread.idl b/comm/mailnews/base/public/nsIMsgThread.idl
new file mode 100644
index 0000000000..91cb995c84
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgThread.idl
@@ -0,0 +1,35 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "MailNewsTypes2.idl"
+
+interface nsIMsgEnumerator;
+interface nsIMsgDBHdr;
+interface nsIDBChangeAnnouncer;
+
+[scriptable, uuid(84052876-90e9-4e21-ad38-13e2bb751d8f)]
+interface nsIMsgThread : nsISupports {
+  attribute nsMsgKey threadKey;
+  attribute unsigned long flags;
+  attribute ACString subject;
+  attribute unsigned long newestMsgDate;
+  readonly attribute unsigned long numChildren;
+  readonly attribute unsigned long numUnreadChildren;
+
+  void addChild(in nsIMsgDBHdr child, in nsIMsgDBHdr inReplyTo, in boolean threadInThread, in nsIDBChangeAnnouncer announcer);
+  nsMsgKey getChildKeyAt(in unsigned long index);
+  nsIMsgDBHdr getChild(in nsMsgKey msgKey);
+  nsIMsgDBHdr getChildHdrAt(in unsigned long index);
+  nsIMsgDBHdr getRootHdr();
+  void removeChildAt(in unsigned long index);
+  void removeChildHdr(in nsIMsgDBHdr child, in nsIDBChangeAnnouncer announcer);
+
+  void markChildRead(in boolean bRead);
+
+  nsIMsgDBHdr getFirstUnreadChild();
+
+  nsIMsgEnumerator enumerateMessages(in nsMsgKey parent);
+};
diff --git a/comm/mailnews/base/public/nsIMsgUserFeedbackListener.idl b/comm/mailnews/base/public/nsIMsgUserFeedbackListener.idl
new file mode 100644
index 0000000000..f798c4b86c
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgUserFeedbackListener.idl
@@ -0,0 +1,28 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgMailNewsUrl;
+
+/**
+ * Implement this interface to subscribe to errors and warnings passed out via
+ * nsIMsgMailSession.
+ */
+[scriptable, uuid(5e909ffa-77fe-4ce3-bf3c-06c54596d03d)]
+interface nsIMsgUserFeedbackListener : nsISupports {
+  /**
+   * Called when an alert from a protocol level implementation is generated.
+   *
+   * @param aMessage    The localized message string to alert.
+   * @param aUrl        Optional mailnews url which is relevant to the operation
+   *                    which caused the alert to be generated.
+   * @return            True if you serviced the alert and it does not need
+   *                    to be prompted to the user separately.
+   *                    Note: The caller won't prompt if msgWindow in aUrl is
+   *                    null, regardless of the value returned.
+   */
+  boolean onAlert(in AString aMessage, [optional] in nsIMsgMailNewsUrl aUrl);
+};
diff --git a/comm/mailnews/base/public/nsIMsgWindow.idl b/comm/mailnews/base/public/nsIMsgWindow.idl
new file mode 100644
index 0000000000..2cbae8e23f
--- /dev/null
+++ b/comm/mailnews/base/public/nsIMsgWindow.idl
@@ -0,0 +1,64 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgStatusFeedback;
+interface nsIMsgFolder;
+interface nsITransactionManager;
+interface nsIDocShell;
+interface mozIDOMWindowProxy;
+interface nsIPrompt;
+interface nsIInterfaceRequestor;
+interface nsIAuthPrompt;
+interface nsIPrincipal;
+
+[scriptable, uuid(a846fe48-4022-4296-a1c4-1dcd7eaecfe5)]
+interface nsIMsgWindow : nsISupports {
+  attribute nsIMsgStatusFeedback statusFeedback;
+  attribute nsITransactionManager transactionManager;
+  attribute nsIMsgFolder openFolder;
+
+  /**
+   * @note Setting this attribute has various side effects, including
+   * wiring up this object as the parent nsIURIContentListener for the
+   * passed-in docshell as well as setting the message content policy service
+   * to listen for OnLocationChange notifications.
+   */
+  attribute nsIDocShell rootDocShell;
+
+  /**
+   * @note Small helper function used to optimize our use of a weak reference
+   * on the message window docshell. Under no circumstances should you be
+   * holding on to the docshell returned here outside the scope of your routine.
+   */
+  readonly attribute nsIDocShell messageWindowDocShell;
+
+  /**
+   * These are currently used to set notification callbacks on
+   * protocol channels to handle things like bad cert exceptions.
+   */
+  attribute nsIInterfaceRequestor notificationCallbacks;
+
+  /**
+    Has a running url been stopped? If you care about checking
+    this flag, you need to clear it before you start your operation since
+    there's no convenient place to clear it.
+  */
+  attribute boolean stopped;
+
+  attribute mozIDOMWindowProxy domWindow;
+
+  void StopUrls();
+
+  /**
+    when the msg window is being unloaded from the content window,
+    we can use this notification to force a flush on anything the
+    msg window hangs on too. For some reason xpconnect is still hanging
+    onto the msg window even though all of our objects have let go of it
+    this forces a release...
+   */
+  void closeWindow();
+};
diff --git a/comm/mailnews/base/public/nsISpamSettings.idl b/comm/mailnews/base/public/nsISpamSettings.idl
new file mode 100644
index 0000000000..96c81c6c08
--- /dev/null
+++ b/comm/mailnews/base/public/nsISpamSettings.idl
@@ -0,0 +1,97 @@
+/* -*- Mode: idl; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIOutputStream;
+interface nsIMsgIncomingServer;
+interface nsIMsgDBHdr;
+interface nsIFile;
+
+[scriptable, uuid(1772BE95-FDA9-4dfd-A663-8AF92C1E3024)]
+interface nsISpamSettings: nsISupports {
+  /**
+   * 0 for nothing, 100 for highest
+   */
+  attribute long level;
+
+  attribute boolean moveOnSpam;
+  readonly attribute boolean markAsReadOnSpam;
+
+  /**
+   * Most consumers will just use spamFolderURI rather than accessing any of
+   * target attributes directly.
+   */
+  attribute long moveTargetMode;
+  const long MOVE_TARGET_MODE_ACCOUNT = 0;
+  const long MOVE_TARGET_MODE_FOLDER = 1;
+  // Despite their name the following are URIs.
+  attribute AUTF8String actionTargetAccount;
+  attribute AUTF8String actionTargetFolder;
+
+  /**
+   * built from moveTargetMode, actionTargetAccount, actionTargetFolder
+   */
+  readonly attribute AUTF8String spamFolderURI;
+
+  attribute boolean purge;
+  /**
+   * interval, in days
+   */
+  attribute long purgeInterval;
+
+  attribute boolean useWhiteList;
+  attribute AUTF8String whiteListAbURI;
+
+  /**
+   * Should we do something when the user manually marks a message as junk?
+   */
+  readonly attribute boolean manualMark;
+
+  /**
+   * With manualMark true, which action (move to the Junk folder, or delete)
+   * should we take when the user marks a message as junk.
+   */
+  readonly attribute long manualMarkMode;
+  const long MANUAL_MARK_MODE_MOVE = 0;
+  const long MANUAL_MARK_MODE_DELETE = 1;
+
+  /**
+   * integrate with server-side spam detection programs
+   */
+  attribute boolean useServerFilter;
+  attribute ACString serverFilterName;
+  readonly attribute nsIFile serverFilterFile;
+  const long TRUST_POSITIVES = 1;
+  const long TRUST_NEGATIVES = 2;
+  attribute long serverFilterTrustFlags;
+
+  // for logging
+  readonly attribute boolean loggingEnabled;
+  attribute nsIOutputStream logStream;
+  void logJunkHit(in nsIMsgDBHdr aMsgHdr, in boolean aMoveMessage);
+  void logJunkString(in string aLogText);
+  void clone(in nsISpamSettings aSpamSettings);
+
+  // aServer -> spam settings are associated with a particular server
+  void initialize(in nsIMsgIncomingServer aServer);
+
+  /**
+   * check if junk processing for a message should be bypassed
+   *
+   * Typically this is determined by comparing message to: address
+   * to a whitelist of known good addresses or domains.
+   *
+   * @param aMsgHdr  database header representing the message.
+   *
+   * @return         true  if this message is whitelisted, and junk
+   *                       processing should be bypassed
+   *
+   *                 false otherwise (including in case of error)
+   */
+  boolean checkWhiteList(in nsIMsgDBHdr aMsgHdr);
+
+};
diff --git a/comm/mailnews/base/public/nsIStatusBarBiffManager.idl b/comm/mailnews/base/public/nsIStatusBarBiffManager.idl
new file mode 100644
index 0000000000..88dc4d7b40
--- /dev/null
+++ b/comm/mailnews/base/public/nsIStatusBarBiffManager.idl
@@ -0,0 +1,13 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIMsgFolder.idl"
+#include "nsIFolderListener.idl"
+
+[scriptable, uuid(20b81f2b-ea81-4baa-b378-c5e6d3dc94e5)]
+interface nsIStatusBarBiffManager : nsIFolderListener {
+  // see  nsIMsgFolder for definition and constants
+  readonly attribute nsMsgBiffState biffState;
+};
diff --git a/comm/mailnews/base/public/nsIStopwatch.idl b/comm/mailnews/base/public/nsIStopwatch.idl
new file mode 100644
index 0000000000..6e40ace070
--- /dev/null
+++ b/comm/mailnews/base/public/nsIStopwatch.idl
@@ -0,0 +1,44 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "nsISupports.idl"
+
+/**
+ * Simple stopwatch mechanism for determining the amount of wall-clock time and
+ * CPU time (user + system) that has elapsed.  It is not fancy.  It is either
+ * running or it is not.  If you want coherent cpu and real time values, then
+ * you had better stop it first.  It does not keep counting when stopped,
+ * although one could add a resumeRetroactive or something to accomplish that.
+ */
+[scriptable, uuid(7a671d6e-d48f-4a4f-b87e-644815a5e381)]
+interface nsIStopwatch : nsISupports {
+  /**
+   * Start the stopwatch; all counters are reset to zero.  If you want to
+   * keep the already accumulated values, use resume instead.
+   */
+  void start();
+
+  /**
+   * Stop the stopwatch.
+   */
+  void stop();
+
+  /**
+   * Resume the stopwatch without clearing the existing counters.  Any time
+   * already accumulated on cpuTime/realTime will be kept.
+   */
+  void resume();
+
+  /**
+   * The total CPU time (user + system) in seconds accumulated between calls to
+   * start/resume and stop.  You have to stop the stopwatch to cause this value
+   * to update.
+   */
+  readonly attribute double cpuTimeSeconds;
+  /**
+   * The total wall clock time in seconds accumulated between calls to
+   * start/resume and stop.  You have to stop the stopwatch to cause this value
+   * to update.
+   */
+  readonly attribute double realTimeSeconds;
+};
diff --git a/comm/mailnews/base/public/nsISubscribableServer.idl b/comm/mailnews/base/public/nsISubscribableServer.idl
new file mode 100644
index 0000000000..70b0d980db
--- /dev/null
+++ b/comm/mailnews/base/public/nsISubscribableServer.idl
@@ -0,0 +1,74 @@
+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIMsgWindow;
+interface nsIMsgIncomingServer;
+interface nsITreeView;
+interface nsIUTF8StringEnumerator;
+
+/**
+ * A listener to receive notification of the subscribable folders of a server.
+ */
+[scriptable, uuid(f337b84a-1dd1-11b2-97c7-fb8b2e3f2280)]
+interface nsISubscribeListener : nsISupports {
+  /**
+   * The server has finished finding all folders to subscribe to.
+   */
+  void OnDonePopulating();
+};
+
+[scriptable, uuid(14b8597a-755b-4e93-b364-e0903801e6ea)]
+interface nsISubscribableServer : nsISupports {
+  attribute nsISubscribeListener subscribeListener;
+  attribute char delimiter;
+
+  void startPopulating(in nsIMsgWindow aMsgWindow, in boolean forceToServer, in boolean getOnlyNew);
+  void startPopulatingWithUri(in nsIMsgWindow aMsgWindow, in boolean forceToServer, in AUTF8String uri);
+  void stopPopulating(in nsIMsgWindow aMsgWindow);
+
+  // return true if state changed, false otherwise
+  boolean setState(in AUTF8String path, in boolean state);
+
+  void subscribeCleanup();
+
+  void subscribe(in wstring name);
+  void unsubscribe(in wstring name);
+
+    void commitSubscribeChanges();
+
+    // other stuff
+  void setIncomingServer(in nsIMsgIncomingServer server);
+  void addTo(in AUTF8String aName, in boolean addAsSubscribed,
+            in boolean aSubscribable, in boolean aChangeIfExists);
+  void setAsSubscribed(in AUTF8String path);
+  void updateSubscribed();
+  void setShowFullName(in boolean showFullName);
+
+  // if path is null, use the root
+  boolean hasChildren(in AUTF8String path);
+  // if path is null, use the root
+  boolean isSubscribed(in AUTF8String path);
+  // if path is null, use the root
+  boolean isSubscribable(in AUTF8String path);
+  // if path is null, use the root
+  AString getLeafName(in AUTF8String path);
+
+  /**
+   * Returns the children uris underneath the specified uri (path).
+   *
+   * @param  aPath  The server's uri; If this is null or empty, then the
+   *                root server uri will be used.
+   */
+  Array<AUTF8String> getChildURIs(in AUTF8String aPath);
+  // if path is null, use the root
+  AUTF8String getFirstChildURI(in AUTF8String path);
+
+  // for searching
+  void setSearchValue(in AString searchValue);
+  readonly attribute boolean supportsSubscribeSearch;
+  readonly attribute nsITreeView folderView;
+};
diff --git a/comm/mailnews/base/public/nsIUrlListener.idl b/comm/mailnews/base/public/nsIUrlListener.idl
new file mode 100644
index 0000000000..93df30b6cd
--- /dev/null
+++ b/comm/mailnews/base/public/nsIUrlListener.idl
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIURI;
+
+%{C++
+#include "nsIURL.h"
+%}
+
+/// General interface that signify URL processing.
+[scriptable, uuid(47618220-D008-11d2-8069-006008128C4E)]
+interface nsIUrlListener : nsISupports {
+    /**
+     * Called to signify the beginning of an URL processing.
+     *
+     * @param url URL being processed.
+     */
+    void OnStartRunningUrl(in nsIURI url);
+
+    /**
+     * Called to signify the end of an URL processing.
+     * This call is always preceded by a call to OnStartRunningUrl.
+     *
+     * @param url        URL being processed.
+     * @param aExitCode  A result code of URL processing.
+     */
+    void OnStopRunningUrl(in nsIURI url, in nsresult aExitCode);
+};
diff --git a/comm/mailnews/base/public/nsIUserInfo.idl b/comm/mailnews/base/public/nsIUserInfo.idl
new file mode 100644
index 0000000000..c8e6fef78d
--- /dev/null
+++ b/comm/mailnews/base/public/nsIUserInfo.idl
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+/**
+ * These are things the system may know about the current user.
+ */
+[scriptable, uuid(6c1034f0-1dd2-11b2-aa14-e6657ed7bb0b)]
+interface nsIUserInfo : nsISupports
+{
+    readonly attribute AString fullname;
+
+    readonly attribute AString emailAddress;
+
+    readonly attribute AString username;
+
+    readonly attribute AString domain;
+};
+
+%{C++
+
+// 14c13684-1dd2-11b2-9463-bb10ba742554
+#define NS_USERINFO_CID \
+{  0x14c13684, 0x1dd2, 0x11b2, \
+  {0x94, 0x63, 0xbb, 0x10, 0xba, 0x74, 0x25, 0x54}}
+
+#define NS_USERINFO_CONTRACTID "@mozilla.org/userinfo;1"
+
+%}
diff --git a/comm/mailnews/base/public/nsMsgFolderFlags.idl b/comm/mailnews/base/public/nsMsgFolderFlags.idl
new file mode 100644
index 0000000000..a36fe002e4
--- /dev/null
+++ b/comm/mailnews/base/public/nsMsgFolderFlags.idl
@@ -0,0 +1,117 @@
+/*-*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+// This must be limited to unsigned long (uint32_t, no uint64_t)
+// as long as nsIMsgFolder exposes the 'flags' property which contains
+// all the flags values. The callers are used to do
+// (folder.flags & nsMsgFolderFlags.<flagname>) in Javascript
+// which cuts the value to 32bit only. See bug 813459.
+typedef unsigned long nsMsgFolderFlagType;
+
+/// Flags about a folder or a newsgroup.
+[scriptable,uuid(440cd0fc-b4b3-4a0f-a492-92fbe7920588)]
+interface nsMsgFolderFlags : nsISupports {
+  /**
+   * @name Folder Type Flags
+   * These flags define the type of folder. Exactly one will be set.
+   * @{
+   */
+  /// This folder is a newsgroup folder.
+  const nsMsgFolderFlagType Newsgroup       = 0x00000001;
+  /// Used to be for a folder that is a news server (NewsHost).
+  const nsMsgFolderFlagType Unused3         = 0x00000002;
+  /// This folder is a mail folder.
+  const nsMsgFolderFlagType Mail            = 0x00000004;
+  /** @} */
+
+  /** Whether this is a directory: NewsHosts are always directories;
+   *  NewsGroups can be directories if we are in ``show all groups'' mode;
+   *  Mail folders will have this bit if they are really directories, not files.
+   *  (Note that directories may have zero children.)
+   */
+  const nsMsgFolderFlagType Directory       = 0x00000008;
+  /** Whether the children of this folder are currently hidden in the listing.
+   *  This will only be present if the nsMsgFolderFlags::Directory bit is on.
+   */
+  const nsMsgFolderFlagType Elided          = 0x00000010;
+  /// Whether this is a virtual search folder
+  const nsMsgFolderFlagType Virtual         = 0x00000020;
+
+  /** @name News Folder Flags
+   *  These flags only occur in folders which have
+   *  the nsMsgFolderFlags::Newsgroup bit set, and do
+   *  not have the nsMsgFolderFlags::Directory or
+   *  nsMsgFolderFlags::Elided bits set.
+   *  @{
+   */
+  /// Used to be for folders representing a subscribed newsgroup (Subscribed).
+  const nsMsgFolderFlagType Unused5         = 0x00000040;
+  /// Used to be for new newsgroups added by the `Check New Groups' command.
+  const nsMsgFolderFlagType Unused2         = 0x00000080;
+  /** @} */
+
+  /** @name Mail Folder Flags
+   *  These flags only occur in folders which have
+   *  the nsMsgFolderFlags::Mail bit set, and do
+   *  not have the nsMsgFolderFlags::Directory or
+   *  nsMsgFolderFlags::Elided bits set.
+   *  @{
+   */
+  /// Whether this is the trash folder.
+  const nsMsgFolderFlagType Trash           = 0x00000100;
+  /// Whether this is a folder that sent mail gets delivered to.
+  const nsMsgFolderFlagType SentMail        = 0x00000200;
+  /// Whether this is the folder in which unfinished, unsent messages are saved for later editing.
+  const nsMsgFolderFlagType Drafts          = 0x00000400;
+  /// Whether this is the folder in which messages are queued for later delivery.
+  const nsMsgFolderFlagType Queue           = 0x00000800;
+  /// Whether this is the primary inbox folder.
+  const nsMsgFolderFlagType Inbox           = 0x00001000;
+  /// Whether this folder on online IMAP
+  const nsMsgFolderFlagType ImapBox         = 0x00002000;
+  /// Whether this is an archive folder
+  const nsMsgFolderFlagType Archive         = 0x00004000;
+  /// This used to be used for virtual newsgroups
+  const nsMsgFolderFlagType Unused1         = 0x00008000;
+  /// Used to be for categories
+  const nsMsgFolderFlagType Unused4         = 0x00010000;
+  /// Used to be for new msgs in a folder
+  const nsMsgFolderFlagType Unused7         = 0x00020000;
+  /// Used to be for a folder that is an IMAP server (ImapServer)
+  const nsMsgFolderFlagType Unused6         = 0x00040000;
+  /// This folder is an IMAP personal folder
+  const nsMsgFolderFlagType ImapPersonal    = 0x00080000;
+  /// This folder is an IMAP public folder
+  const nsMsgFolderFlagType ImapPublic      = 0x00100000;
+  /// This folder is another user's IMAP folder.  Think of it like a folder that someone would share.
+  const nsMsgFolderFlagType ImapOtherUser   = 0x00200000;
+  /// Whether this is the template folder
+  const nsMsgFolderFlagType Templates       = 0x00400000;
+  /// This folder is one of your personal folders that is shared with other users
+  const nsMsgFolderFlagType PersonalShared  = 0x00800000;
+  /// This folder is an IMAP \\Noselect folder
+  const nsMsgFolderFlagType ImapNoselect    = 0x01000000;
+  /// This folder created offline (this is never set in current code,
+  /// but it is still checked for and obeyed if found on a folder.
+  const nsMsgFolderFlagType CreatedOffline  = 0x02000000;
+  /// This imap folder cannot have children :-(
+  const nsMsgFolderFlagType ImapNoinferiors = 0x04000000;
+  /// This folder configured for offline use
+  const nsMsgFolderFlagType Offline         = 0x08000000;
+  /// This folder has offline events to play back
+  const nsMsgFolderFlagType OfflineEvents   = 0x10000000;
+  /// This folder is checked for new messages
+  const nsMsgFolderFlagType CheckNew        = 0x20000000;
+  /// This folder is for spam messages
+  const nsMsgFolderFlagType Junk            = 0x40000000;
+  /// This folder is in favorites view
+  const nsMsgFolderFlagType Favorite        = 0x80000000;
+  /// Special-use folders
+  const nsMsgFolderFlagType SpecialUse = Inbox|Drafts|Trash|SentMail|
+                                         Templates|Junk|Archive|Queue;
+  /** @} */
+};
diff --git a/comm/mailnews/base/public/nsMsgGroupnameFlags.h b/comm/mailnews/base/public/nsMsgGroupnameFlags.h
new file mode 100644
index 0000000000..11056807ab
--- /dev/null
+++ b/comm/mailnews/base/public/nsMsgGroupnameFlags.h
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _msgGroupnameFlags_h_
+#define _msgGroupnameFlags_h_
+
+/* Flags in the subscribe pane (used inside of MSG_GroupNameLine). Where
+   the flags overlap with the nsMsgFolderFlags flags, it has the same value,
+   to reduce the chance of someone using the wrong constant. */
+
+/* Whether the children of this group are currently hidden in the listing.
+   This will only be present if it has any children. */
+#define MSG_GROUPNAME_FLAG_ELIDED 0x0010
+
+/* Whether this folder represents a moderated newsgroup. */
+#define MSG_GROUPNAME_FLAG_MODERATED 0x0020
+
+/* Whether this folder represents a subscribed newsgroup. */
+#define MSG_GROUPNAME_FLAG_SUBSCRIBED 0x0040
+
+/* A newsgroup which has just been added by the `Check New Groups` command. */
+#define MSG_GROUPNAME_FLAG_NEW_GROUP 0x0080
+
+/* Whether there are children of this group. Whether those children are visible
+   in this list is determined by the above "ELIDED" flag. Setting this to the
+   same value as an nsMsgFolderFlags IMAP server, since an IMAP _server_ will
+   never appear in the subscribe pane. */
+#define MSG_GROUPNAME_FLAG_HASCHILDREN 0x40000
+
+/* folder is an IMAP personal folder */
+#define MSG_GROUPNAME_FLAG_IMAP_PERSONAL 0x80000
+
+/* folder is an IMAP public folder */
+#define MSG_GROUPNAME_FLAG_IMAP_PUBLIC 0x100000
+
+/* folder is another user's IMAP folder */
+#define MSG_GROUPNAME_FLAG_IMAP_OTHER_USER 0x200000
+
+/* A \NoSelect IMAP folder */
+#define MSG_GROUPNAME_FLAG_IMAP_NOSELECT 0x400000
+
+/* whether or not this folder is one of your personal folders that is shared
+   with other users */
+#define MSG_GROUPNAME_FLAG_PERSONAL_SHARED 0x800000
+
+#endif
diff --git a/comm/mailnews/base/public/nsMsgHeaderMasks.h b/comm/mailnews/base/public/nsMsgHeaderMasks.h
new file mode 100644
index 0000000000..6de0194096
--- /dev/null
+++ b/comm/mailnews/base/public/nsMsgHeaderMasks.h
@@ -0,0 +1,53 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _msgHeaderMasks_h_
+#define _msgHeaderMasks_h_
+// clang-format off
+
+DO NOT USE ANYMORE!!!
+/* This set enumerates the header fields which may be displayed in the
+   message composition window.
+ */
+#define MSG_FROM_HEADER_MASK                0x00000001
+#define MSG_REPLY_TO_HEADER_MASK            0x00000002
+#define MSG_TO_HEADER_MASK                  0x00000004
+#define MSG_CC_HEADER_MASK                  0x00000008
+#define MSG_BCC_HEADER_MASK                 0x00000010
+#define MSG_FCC_HEADER_MASK                 0x00000020
+#define MSG_NEWSGROUPS_HEADER_MASK          0x00000040
+#define MSG_FOLLOWUP_TO_HEADER_MASK         0x00000080
+#define MSG_SUBJECT_HEADER_MASK             0x00000100
+#define MSG_ATTACHMENTS_HEADER_MASK         0x00000200
+
+/* These next four are typically not ever displayed in the UI, but are still
+   stored and used internally. */
+#define MSG_ORGANIZATION_HEADER_MASK        0x00000400
+#define MSG_REFERENCES_HEADER_MASK          0x00000800
+#define MSG_OTHERRANDOMHEADERS_HEADER_MASK  0x00001000
+#define MSG_NEWSPOSTURL_HEADER_MASK         0x00002000
+
+#define MSG_PRIORITY_HEADER_MASK            0x00004000
+//#define MSG_NEWS_FCC_HEADER_MASK          0x00008000
+//#define MSG_MESSAGE_ENCODING_HEADER_MASK  0x00010000
+#define MSG_CHARACTER_SET_HEADER_MASK       0x00008000
+#define MSG_MESSAGE_ID_HEADER_MASK          0x00010000
+//#define MSG_NEWS_BCC_HEADER_MASK          0x00080000
+
+/* This is also not exposed to the UI; it's used internally to help remember
+   whether the original message had an HTML portion that we can quote. */
+//#define MSG_HTML_PART_HEADER_MASK         0x00100000
+
+/* The "body=" pseudo-header (as in "mailto:me?body=hi+there") */
+//#define MSG_DEFAULTBODY_HEADER_MASK       0x00200000
+
+#define MSG_X_TEMPLATE_HEADER_MASK          0x00020000
+
+#define MSG_FCC2_HEADER_MASK                0x00400000
+
+/* IMAP folders for posting */
+//#define MSG_IMAP_FOLDER_HEADER_MASK       0x02000000
+// clang-format on
+#endif
diff --git a/comm/mailnews/base/public/nsMsgLocalFolderHdrs.h b/comm/mailnews/base/public/nsMsgLocalFolderHdrs.h
new file mode 100644
index 0000000000..bc794567f8
--- /dev/null
+++ b/comm/mailnews/base/public/nsMsgLocalFolderHdrs.h
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef _nsMsgLocalFolderHdrs_H
+#define _nsMsgLocalFolderHdrs_H
+// clang-format off
+
+/* The Netscape-specific header fields that we use for storing our
+   various bits of state in mail folders.
+ */
+#define X_MOZILLA_STATUS           "X-Mozilla-Status"
+#define X_MOZILLA_STATUS_FORMAT     X_MOZILLA_STATUS ": %4.4x"
+#define X_MOZILLA_STATUS_LEN      /*1234567890123456*/      16
+
+#define X_MOZILLA_STATUS2          "X-Mozilla-Status2"
+#define X_MOZILLA_STATUS2_FORMAT    X_MOZILLA_STATUS2 ": %8.8x"
+#define X_MOZILLA_STATUS2_LEN     /*12345678901234567*/     17
+
+#define X_MOZILLA_DRAFT_INFO       "X-Mozilla-Draft-Info"
+#define X_MOZILLA_DRAFT_INFO_LEN  /*12345678901234567890*/  20
+
+#define X_MOZILLA_NEWSHOST         "X-Mozilla-News-Host"
+#define X_MOZILLA_NEWSHOST_LEN    /*1234567890123456789*/   19
+
+#define X_UIDL                     "X-UIDL"
+#define X_UIDL_LEN                /*123456*/                 6
+
+#define CONTENT_LENGTH             "Content-Length"
+#define CONTENT_LENGTH_LEN        /*12345678901234*/        14
+
+/* Provide a common means of detecting empty lines in a message. i.e. to detect the end of headers among other things...*/
+#define EMPTY_MESSAGE_LINE(buf) (buf[0] == '\r' || buf[0] == '\n' || buf[0] == '\0')
+
+
+// The default data for the X-Mozilla-Keys header. 80 spaces, room to set
+// a bunch of keywords before we have to rewrite the rest of the message.
+#define X_MOZILLA_KEYWORDS_BLANK "                                                                                "
+#define X_MOZILLA_KEYWORDS_BLANK_LEN 80
+
+/* blank filled header to store keyword/tags in the mailbox */
+#define X_MOZILLA_KEYWORDS "X-Mozilla-Keys: " X_MOZILLA_KEYWORDS_BLANK MSG_LINEBREAK
+#define X_MOZILLA_KEYWORDS_LEN (sizeof(X_MOZILLA_KEYWORDS) - 1)
+
+// clang-format on
+#endif
diff --git a/comm/mailnews/base/public/nsMsgMessageFlags.idl b/comm/mailnews/base/public/nsMsgMessageFlags.idl
new file mode 100644
index 0000000000..2dac966b12
--- /dev/null
+++ b/comm/mailnews/base/public/nsMsgMessageFlags.idl
@@ -0,0 +1,183 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+typedef unsigned long nsMsgMessageFlagType;
+
+/// Flags about a single message.
+[scriptable,uuid(1ea3acdb-7b9f-4e35-9513-76e0a0cc6baa)]
+interface nsMsgMessageFlags : nsISupports
+{
+  /// This message has been read
+  const nsMsgMessageFlagType Read            = 0x00000001;
+
+  /// A reply to this message has been successfully sent
+  const nsMsgMessageFlagType Replied         = 0x00000002;
+
+  /// This message has been flagged
+  const nsMsgMessageFlagType Marked          = 0x00000004;
+
+  /**
+   * This message has already gone, but the folder hasn't been compacted yet.
+   * Since actually removing a message from a folder is a semi-expensive
+   * operation, we tend to delay it; messages with this bit set will be removed
+   * the next time folder compaction is done.  Once this bit is set, it never
+   * gets un-set.
+   */
+  const nsMsgMessageFlagType Expunged        = 0x00000008;
+
+  /**
+   * The subject of this message has "Re:" on the front.  The folder summary
+   * uniquifies all of the strings in it, and to help this, any string which
+   * begins with "Re:" has that stripped first.  This bit is then set, so that
+   * when presenting the message, we know to put it back (since the "Re:" is
+   * not itself stored in the file.)
+   */
+  const nsMsgMessageFlagType HasRe           = 0x00000010;
+
+  /// The children of this sub-thread are folded in the display
+  const nsMsgMessageFlagType Elided          = 0x00000020;
+
+  /// The message is a feed, originally downloaded in a server.type=rss account
+  const nsMsgMessageFlagType FeedMsg         = 0x00000040;
+
+  /// This news article or IMAP message is present in the disk cache
+  const nsMsgMessageFlagType Offline         = 0x00000080;
+
+  /// This thread is being watched
+  const nsMsgMessageFlagType Watched         = 0x00000100;
+
+  /// This message's sender has been authenticated when sending this message
+  const nsMsgMessageFlagType SenderAuthed    = 0x00000200;
+
+  /**
+   * This message's body is only the first ten or so of the message, and we
+   * need to add a link to let the user download the rest of it from the POP
+   * server.
+   */
+  const nsMsgMessageFlagType Partial         = 0x00000400;
+
+  /**
+   * This message is queued for delivery.  This only ever gets set on messages
+   * in the queue folder, but is used to protect against the case of other
+   * messages having made their way in there somehow -- if some other program
+   * put a message in the queue, we don't want to later deliver it!
+   */
+  const nsMsgMessageFlagType Queued          = 0x00000800;
+
+  /// This message has been forwarded
+  const nsMsgMessageFlagType Forwarded       = 0x00001000;
+
+  /// This message has been redirected
+  const nsMsgMessageFlagType Redirected      = 0x00002000;
+
+  /**
+   * These are used to remember the message priority in the mozilla status
+   * flags, so we can regenerate a priority after a rule (or user) has changed
+   * it. They are not returned in MSG_MessageLine.flags, just in mozilla-status,
+   * so if you need more non-persistent flags, you could share these bits. But
+   * it would be wrong.
+   */
+  const nsMsgMessageFlagType Priorities      = 0x0000E000;
+
+  /// This message is new since the last time the folder was closed
+  const nsMsgMessageFlagType New             = 0x00010000;
+
+  /// This thread has been ignored
+  const nsMsgMessageFlagType Ignored         = 0x00040000;
+
+  /// This IMAP message has been marked deleted on the server
+  const nsMsgMessageFlagType IMAPDeleted     = 0x00200000;
+
+  /**
+   * This message has requested to send a message delivery notification to its
+   * sender
+   */
+  const nsMsgMessageFlagType MDNReportNeeded = 0x00400000;
+
+  /**
+   * A message delivery notification has been sent for this message. No more
+   * reports should be sent.
+   */
+  const nsMsgMessageFlagType MDNReportSent   = 0x00800000;
+
+  /// This message is a template
+  const nsMsgMessageFlagType Template        = 0x01000000;
+
+  // 0x8000000 is MSG_VIEW_FLAG_ISTHREAD, do not use.
+
+  /// This message has files attached to it
+  const nsMsgMessageFlagType Attachment      = 0x10000000;
+
+  // 0x20000000 is MSG_VIEW_FLAG_DUMMY, do not use.
+  // 0x40000000 is MSG_VIEW_FLAG_HASCHILDREN, do not use.
+
+  /**
+   * These are used to remember the message labels in the mozilla status2
+   * flags. so we can regenerate a priority after a  rule (or user) has changed
+   * it. They are not returned in nsMsgHdr.flags, just in mozilla-status2, so
+   * if you need more non-persistent flags, you could share these bits. But it
+   * would be wrong.
+   */
+  const nsMsgMessageFlagType Labels          = 0x0E000000;
+
+  // We're trying to reserve the high byte of the flags for view flags, so,
+  // don't add flags to the high byte if possible.
+
+  /// The list of all message flags to not write to disk
+  const nsMsgMessageFlagType RuntimeOnly     = Elided;
+};
+
+typedef unsigned long nsMsgProcessingFlagType;
+
+/**
+ * Definitions of processing flags. These flags are not saved to the database.
+ * They are used to define states for message processing. Any changes
+ * to these flags need to be supported in the key sets in nsMsgDBFolder
+ */
+[scriptable,uuid(1f7d642b-de2a-45f0-a27f-9c9ce0b741d8)]
+interface nsMsgProcessingFlags : nsISupports
+{
+  /// This message needs junk classification
+  const nsMsgProcessingFlagType ClassifyJunk   = 0x00000001;
+
+  /// This message needs traits classification
+  const nsMsgProcessingFlagType ClassifyTraits = 0x00000002;
+
+  /// This message has completed any needed traits classification
+  const nsMsgProcessingFlagType TraitsDone     = 0x00000004;
+
+  /// This message has completed any needed postPlugin filtering
+  const nsMsgProcessingFlagType FiltersDone    = 0x00000008;
+
+  /// This message has a move scheduled by filters
+  const nsMsgProcessingFlagType FilterToMove   = 0x00000010;
+
+  /**
+   * This message is new to the folder and has yet to be reported via the
+   *  msgsClassified notification. This flag is required because the previously
+   *  used mechanism relied on the database's list of new messages and its
+   *  concept of 'new' is overloaded and has user-visible ramifications.  This
+   *  led to messages potentially being considered multiple times.
+   *
+   * Unfortunately none of the Done processing flags above are suitable for our
+   *  needs because they are not consistently applied and basically constitute
+   *  memory leaks (which makes the not consistently applied thing a good
+   *  thing.)
+   *
+   * I suspect we cannot reliably convert the Done flags above to our use case
+   *  either because of the situation where the user quits the program after the
+   *  messages are added but before the messages are processed.  Since the
+   *  processing flags are suppression flags, assuming the 'new' status is
+   *  persisted to the next time we are run, then this would represent a
+   *  change in behaviour.  I would need to exactly understand the new semantics
+   *  to know for sure though.
+   */
+  const nsMsgProcessingFlagType NotReportedClassified = 0x00000020;
+
+  /// Number of processing flags
+  const nsMsgProcessingFlagType NumberOfFlags  = 6;
+};
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-07 17:32:43 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-07 17:32:43 +0000
commit	6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
tree	a68f146d7fa01f0134297619fbe7e33db084e0aa /comm/mailnews/base/public
parent	Initial commit. (diff)
download	thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip