Rated 4 out of 5 stars
Version 0.2.23 works very nice (I particularly use keyboard shortcuts to folders), provided I always refuse updates, as I never could get the following versions work.
Here is the information about my Thunderbird :
Thunderbird version 3.0.3
Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:188.8.131.52) Gecko/20081209 Thunderbird/184.108.40.206 Mnenhy/0.7.5.0
(some other extensions are installed)
(Windows is XP home SP3)