After update Thunderbird won't retrieve messages from MSN accounts, says I need to enter new password. Have checked and can retrieve if I log into account (using same password I put into Thunderbird) and can get messages that way. It used to get messages from all my accounts until after the update. I read other forum entries and am not running Norton. I've tried all other "solutions" but none have fixed the problem. Only thing I haven't tried is: not using Tbird & get another email client to see if the problem is Tbird.