how to use sync2em with thunderbird

Hi @ all,
i use at home emclient with sync2eM and it works great in combine with my HTC 7 pro.
Now, in the company we use thunderbird.
well, i create a new calendar with caldav an it works fine.
But how i can use the sync for contacts and tasks?
i havent found a way to use this features?
Is it possible?

you need to install some CardDAV plugin for Thunderbird.

Thx, but i dont found carddav as a download for thunderbird.