I have Outlook 2007 installed on two computers. It has the same accounts, using the same passwords and they work fine. Today one of them started acting up and a popup kept asking for the password. I didn't change the password anywhere, and since it still works fine on one computer, I don't understand what is happening. I restarted Outlook several times, but it still happens.

I know I could go and change the password but then, since I didn't change anything, I am not sure why one is accepting it, and one is not.

Any suggestion?