I noticed your post from March 2010 when you were asking for sync solutions between Zimbra and your n900. Like you, I had previously configure this sync via a separate box with Funambol + the Zimbra Connector. An update to Zimbra seems to have broken this for me. There were also some things I could not do with my configuration that I thought I needed to better secure my sync method.
Anyway, I was browsing today for any new developments and thought I would ask if you had any luck with your search.
Thanks for your time