SyncKolab was written to add kolab functionality to Thunderbird. It reads a selected Imap folder and synchronizes it with the local address book and calendar.
Current version is 1.5.0!
If you have problems bugs/try the current nightly (Thundebrid 3/ Seamonkey 2 ONLY!)
Nightly is now working again - but only little - make sure to backup!
Tbird 3 users: address sync should work fine now in the nightly (not yet completely confirmed)
The current nightly seems to work fine for addresses (even fixed most problems with 3.0 like duplicate messages and always update). It's not completely tested yet (see the mailing list) but all the basic tests were successfully.
Lightning sync seems to work - kinda. there are still a few bugs I got to straighten out.