I had that problem on a User the other day , as I set the user up manually Thru MAS / MCD NOT using Windows Active Directory . I did not troubleshoot , only to remove the user and set him back up by importing his info via Integrated Directory . I had some issues with IDS importing the correct user in fo , names , so I tried to set the users up manually
After this , I could not log into Outlook due to the User using windows log on and Outlook was looking for the credentials from the user to log on with Windows Logon . Not too sure exactly what the issue was as I did not have time to troubleshoot . But by using IDS/Windows log on , fixing IDS by clearing out ALL entries and re importing , I was able to get the user to work again .
I know its uin the windows log on but not exactly sure where ...
Hope this helps !
regards
Rich