Swing migration from Exchange 2003 to 2010 behind TMG 2010 SP1.
After configuring the two servers for coexistence, OWA and ActiveSync work just fine as long as the mailbox resides on the Exchange 2003 Server. If the mailbox resides on the Exchange 2010 Server, the page cannot be displayed because the URL in the address box is pointing to the INTERNAL address of 2010 server.
Internally this works just fine. But as the address is not available from the Internet, user simply receive an error.
Everything else appears to be working just fine. Mail flow. Public folder access. We're not looking at a critical situation here. But, I can't proceed with the migration until I can solve this.
I've searched high and low for articles that address my situation, but I have not been successful in finding a solution matching my situation.
I would appreciate any insight.
Bob Esquenazi