We are having an odd situation. We are running Exchange 2003 with Outlook 2003 clients. When my users receive an email from one particular user, it is prompting them for an OWA logon and password. Then can cancel past it and read and manipulate the message, but this happens with every message he sends. The user is question does access his email via OWA. I am at a loss as to what is causing this. Help!