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 3.1.3! (compatible with thunderbird 3-27!)
If you have problems bugs/try the current nightly
Nightly is now working again - but only little - make sure to backup!
Tbird 3 users: please update to a more revent thunderbird version!
If you want to sync with android check out http://code.google.com/p/kolab-android/