If outlook 2007 or 2010 keeps asking for password when connecting to Exchange server, you have two options to solve this problem:
- Close MS Outlook an browse to “C:UsersUSERNAMEAppDataLocalMicrosoft”, here you can delete/rename “Outlook” folder. after removing the folder start outlook and problem should be solved.
- If u are using Windows 7 or higher, then this is usually tied to the cached credentials in the vault. Go to Control panel, user accounts, manage credentials, and then delete any saved credentials.