I have a Exchange 2010 cluster of three servers, all three with all roles. As of now we also have a TMG 2010 acting as aproxy for OWA, Active Sync and Outlook Anywhere.
That means clients connects to the TMG and the TMG forward the requests to the internal servers.
I want to get read of the TMG but how do I handle it's role? What are my options? Just pick one the servers in the cluster, do a NAT-1NAT to an external IP and let clients connect to it?? Or can I configure our Watchguard XTM to handle like the TMG?