RFC 2061 (rfc2061) - Page 3 of 3

IMAP4 Compatibility with IMAP2bis

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RFC 2061                  IMAP4 Compatibility              December 1996


   FLAGS.SILENT, +FLAGS.SILENT, and -FLAGS.SILENT store data items
            Use the corresponding non-SILENT versions and ignore the
            untagged FETCH responses which come back.

   UID fetch data item and the UID commands
            No functional equivalent.

   CLOSE command
            No functional equivalent.


   In IMAP2bis, the TRYCREATE special information token is sent as a
   separate unsolicited OK response instead of inside the NO response.

   IMAP2bis is ambiguous about whether or not flags or internal dates
   are preserved on COPY.  It is impossible to know what behavior is
   supported by the server.

IMAP4 server interoperability with IMAP2bis clients

   The only interoperability problem between an IMAP4 server and a
   well-written IMAP2bis client is an incompatibility with the use of
   "\" in quoted strings.  This is best avoided by using literals
   instead of quoted strings if "\" or  is embedded in the string.

Security Considerations

   Security issues are not discussed in this memo.

Author's Address

   Mark R. Crispin
   Networks and Distributed Computing
   University of Washington
   4545 15th Aveneue NE
   Seattle, WA  98105-4527

   Phone: (206) 543-5762
   EMail: 












Crispin                      Informational
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