This happens to me every couple of months and gets very irritating. A window appears and asks for my password and no matter how many times I input it, it keeps re-appearing. It's the correct password naman and it won't stop til I click on cancel. But that means mail will be offline til I hit the "get mail" button. Then that pesky window pops up again after awhile. What's a good alternative to mail, besides entourage?