Outlook 2002/XP on Windows Vista, Windows 7 or Windows 8
If you are using Outlook 2002/XP on Windows Vista, Windows 7 or Windows 8, then the repeated password prompt is caused by an incompatibility issue. Outlook 2002/XP is not supported on these versions of Windows.
If you do want to continue to use it, you need to provide your password each time that you restart Outlook. As long as you keep Outlook open, it won’t prompt you for your password again.