I second the request for UW imap. I have several gigs of mailboxes in UW imap's own format (mbx and MIX ), and it will be much easier if I can use UW Imap (currently version 2007e) to access those mailboxes. It is true that UW imap development has been slowing down, so it probably should be dropped some time. But probably after
dovecot officially release and recommend mdbox format?...