Every once in a while, Mail will suddenly pop open a window asking me to type in the password for my accounts. I have no idea why it does this because I've never changed the password. Also, I use Mail every day but it only happens...oh, maybe once every two months...then again in 5 weeks...etc... The really annoying thing about this is that last time it happened I just closed the window w/out typing in the password, and it acted as if everything was ok but then I stopped getting emails. A few days later I realized that my accounts were greyed out because Mail had taken them 'offline'. Does anyone know how to stop Mail from occasionally doing this?