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diff --git a/comm/mailnews/intl/nsUTF7ToUnicode.h b/comm/mailnews/intl/nsUTF7ToUnicode.h
new file mode 100644
index 0000000000..b7b5be4522
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+++ b/comm/mailnews/intl/nsUTF7ToUnicode.h
@@ -0,0 +1,64 @@
+/* -*- 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/. */
+
+#ifndef nsUTF7ToUnicode_h___
+#define nsUTF7ToUnicode_h___
+
+//----------------------------------------------------------------------
+// Class nsBasicUTF7Decoder [declaration]
+
+/**
+ * Basic class for a character set converter from UTF-7 to Unicode.
+ *
+ * @created         03/Jun/1999
+ * @author  Catalin Rotaru [CATA]
+ */
+class nsBasicUTF7Decoder {
+ public:
+  /**
+   * Class constructor.
+   */
+  nsBasicUTF7Decoder(char aLastChar, char aEscChar);
+  NS_IMETHOD ConvertNoBuff(const char* aSrc, int32_t* aSrcLength,
+                           char16_t* aDest, int32_t* aDestLength);
+
+ protected:
+  int32_t mEncoding;  // current encoding
+  uint32_t mEncBits;
+  int32_t mEncStep;
+  char mLastChar;
+  char mEscChar;
+  bool mFreshBase64;
+
+  nsresult DecodeDirect(const char* aSrc, int32_t* aSrcLength, char16_t* aDest,
+                        int32_t* aDestLength);
+  nsresult DecodeBase64(const char* aSrc, int32_t* aSrcLength, char16_t* aDest,
+                        int32_t* aDestLength);
+  uint32_t CharToValue(char aChar);
+
+  //--------------------------------------------------------------------
+  // Subclassing of nsBufferDecoderSupport class [declaration]
+
+  NS_IMETHOD Reset();
+};
+
+//----------------------------------------------------------------------
+// Class nsUTF7ToUnicode [declaration]
+
+/**
+ * A character set converter from Modified UTF7 to Unicode.
+ *
+ * @created         18/May/1999
+ * @author  Catalin Rotaru [CATA]
+ */
+class nsUTF7ToUnicode : public nsBasicUTF7Decoder {
+ public:
+  /**
+   * Class constructor.
+   */
+  nsUTF7ToUnicode();
+};
+
+#endif /* nsUTF7ToUnicode_h___ */