Test build of Thunderbird with new spam filter available
As earlier reported, Mozilla developers are updating the techniques for identifying spam. This will make the spam filter even better.
Technical this involves improving the tokenizer plus a new probability algorithm. More information in bug 230093.
Now Scott MacGregor has made an test build available (win32 only) with the new spam filter. It's recommended that you re-train with a clean training.dat before judging the effectivness of the new stuff.
Remember: This is a test build! Read more about how to change the probability threshhold for determining if a message is junk or not.
Update: Read more about this release