Thunderbird 3 Weirdness
After upgrading from version 2 I’ve experienced a lot of bugs and the one that bugged me the most is that mail refused to be marked as read. They just suddenly get marked as unread as soon as I left the folder. So every time i received a mail the notifier would say i had like 22000 new messages.
Now everything works like normal!
Seems like the size of my profile was a bit too much for TB to handle. It was aprox 7 gigs before taking a look into this.
After using “compact” (http://kb.mozillazine.org/Thunderbird_:_Tips_:_Compacting_Folders) on all my folders, deleted all my spam and emptied the trash message-marking now behaves like it should. My profile is now 2.2 gb smaller.