I've just installed Exchange 2010 CAS server. In my enviroment we'll temporarily co-exist Exchange 2010 and 2003 due to the fact that majority of user's email will take time to be moved over to 2010. I need help. I ran the OWAVirtualDirectory cmdlet to redirect from CAS to OWA2003. I can see in the url that we are hitting our OWA2003, however, I am getting an "Unspecified Error" message with a blank page at url https://domain.com/exchweb/bin/auth/owaauth.dll. Anyone have experience this? Help!