Stalker CommuniGate IMAP for Mac

From CommuniGate Systems:

The CommuniGate IMAP module works as a full-featured IMAP4 server, supporting several IMAP clients simultaneously. When users are connected to the CommuniGate server using IMAP client software on any platform, including Macintosh, Windows, Unix, and Newton, they are processed in the same manner the local CommuniGator clients are processed. The IMAP module allows unlimited simultaneous access to the same account for several IMAP clients. The same account can be used with the CommuniGator client application(s) and/or any POP-based mailers (via the POPGate) at the same time. All clients activities are synchronized with the CommuniGate Server and the IMAP module. Also, the IMAP server is fully compatible with Internet messaging standards ie; IMAP and MIME; support for concurrent access to shared mailboxes; and client software that does not need knowledge about the server's file store format.