Exchange 2007 server behind an ISA 2006 firewall. OWA has been configured and working for over a year. Recently began experiencing problems with some persons not able to access the owa webpage (https://owa.domain.com/owa)
After some experimenting we have narrowed it down to an issue with Microsoft Office 2007. Basically any workstation running Office 2007 gets an error message that the server cannot be found. This is true with IE7 or Firefox browsers. Uninstall Office 2007 and the problem goes away. Anyone running Office 2003 does not have a problem.
We cannot seem to find the connection between the two.