Well I installed ISA Server and the exchange server is behind the ISA server. I left the microsoft proxy client on the machine and did and update and that worked fine. I ran chkwsp32 /f and that worked. Problem is that when someone types mailserver.mydomain.com/exchange they get nothing in the browser - they cannot retreive the page. If an outside user tries to ping 207.208.233.130 (external address) there is no ping response. Any ideas?