Thanks for that. One comment on the Edge combined with ISA on a single box: Generally, the recommended way to implement ISA publishing Exchange for OWA etc is to have the ISA server acting as the internal firewall (between the internal and perimeter networks) and as a member of the domain. This is done so that you don't have to open a raft of ports in the internal firewall so that ISA can do domain authentication etc. The Edge requires that the server is not a member of the domain and it is recommended to put it within the perimeter network, with a firewall between it and the internal network. So the 2 don't seem very suited to working well on the same box. Any comments or corrections would be highly appreciated as we get similar questions from our customers a lot and it would be great to be able to provide them with a '1 box' solution. Wouldn't it have been nice if we could have had an option to install an Edge server on a domain member where ISA was configured to protect it.

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As per Microsoft Web Site: ISA server 2006 can only be installed on Microsoft Windows Server 2003 32-bit operating system with Service Pack 1 (SP1) or Microsoft Windows Server 2003 R2 32-bit. Exchange 2007 Edge server requires 64-bit of Windows to run. So the two products cannot simply co-exist on the same physical box. Does anybody knows when Microsoft is going to release 64-bit version of ISA2006 server?