Although some of its commands and responses were similar to IMAP2, the interim protocol lacked command/response tagging and thus its syntax was incompatible with all other versions of IMAP. ===IMAP2=== The interim protocol was quickly replaced by the Interactive Mail Access Protocol (IMAP2), defined in (in 1988) and later updated by (in 1990).
Although some of its commands and responses were similar to IMAP2, the interim protocol lacked command/response tagging and thus its syntax was incompatible with all other versions of IMAP. ===IMAP2=== The interim protocol was quickly replaced by the Interactive Mail Access Protocol (IMAP2), defined in (in 1988) and later updated by (in 1990).
Early versions of Pine were widely distributed with IMAP2bis support (Pine 4.00 and later supports IMAP4rev1). ===IMAP4=== An IMAP Working Group formed in the IETF in the early 1990s took over responsibility for the IMAP2bis design.
It was published as in 1991.
The IMAP2bis.TXT draft documented the state of extensions to IMAP2 as of December 1992.
The IESG reclassified RFC1203 "Interactive Mail Access Protocol - Version 3" as a Historic protocol in 1993.
An internet draft of IMAP2bis was published by the IETF IMAP Working Group in October 1993.
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