I have a domain user running Windows XP Pro SP2. and Outlook 2003. We have an Exchange 2000 server. Normally when a user logs in to their machine, they can then run Outlook without being prompted for credentials. Now, one user is particular is being prompted after never being prompted in the past. I logged in as that user with a different computer and get the same results. No other users on the domain seem to be affected. Anyone know how I can fix this one?