When I setup the mail server at work I picked Zimbra, it’s great.
Today Zimbra just got a bit better when I found Zindus. Zindus is open-source software and runs on all Thunderbird platforms including Windows, Mac OSX and Linux. Zindus can sync your contacts between Zimbra and Thunderbird. It syncs everything from Address Books to your GAL (Global Address List).
It currently supports ZCS 3.x to 5.x. Adding the Lightning and Zindus add-ons to Thunderbird create a very complete desktop client to Zimbra for any platform. Can’t wait to share to good news with my Outlook users ;-)