MailServe for Snow Leopard now includes a fresh 32/64-bit build of Dovecot. While UW/IMAP is still available as an IMAP/POP3 option, the focus is now on Dovecot and what we can build on it. For a start, we now have a high-performance, more fault-tolerant server that supports a multi-level hierarchy of IMAP folders.
Then it allows us to do some things more easily than before, like setting up a spam filter based on Procmail and SpamBayes with just one click.
Plus some of the many things that we've built over the years into MailServe, which have all gotten little tweaks to improve their usefulness - e.g., you can add custom settings to just about everything MailServe handles, e.g., to Fetchmail, Dovecot and Procmail. And you can now manage the mail user accounts from right within MailServe.