We have a SBS 2008 server and a Windows 2003 Terminal Server. We have about 15 users who are able to use all funtionality, including Exchange through Outook 2007. The strange thing is when we add a new user they cannot connect to Exchange using Outlook 2007. When configuring Outlook the user is prompted for his credentails, but they're not accepted. These new users are working on the exact same terminal server, thus the exact same Outlook installation. OWA works just fine for all users.