I have a user's computer running XP Professional, we use Server 2003 and Exchange 2003 Standard edition. The problem is that the user can't access outlook on his computer, but can on another computer, I have also found that I can access my outlook account on his computer, but one of our Administer accounts will not access Outlook on his computer, but will access on another computer. I don't know what is causing the problem. I've uninstalled Office 2003 and reinstalled it under the local administrator and no success, I've unstalled and reinstalled Office 2003 under the domain administrator account and still no success. Does anyone know what this problem is?