I have started to evaluate the Zimbra Desktop client used with a standard IMAP account as a way to trial the rich client and provide better offline email support for myself.
My server is Cyrus IMAP 2.2.13, on Debian/Etch, and is working fine against Emacs/Gnus and Thunderbird.
I have had several issues with the Zimbra Desktop client trying to sync the IMAP data. I failed to identify any existing bugs regarding the two, or any information on cyrus being a supported (or unsupported) platform.
I am going to report the bugs but hoped that I might get some feedback on what, if any, workarounds exist?