We have a single Ex2003 32-bit server (no more than 500 mailboxes) in an isolated site with no OWA/Autodiscover requirement.
I am replacing this server with a 5 server Ex2010 platform consisting of 2 x HubCAS servers, 3 Mailbox Servers, and 2 Network Load Balancers.
The EX2003 server is on an old network (10.) and I am building the new 5 server platform on a new network (172.), these networks do not current talk to each other.
I have built the 5 EX2010 servers to OS level (Server 2012)and have the following questions.
Why can I not install EX2010 server roles onto Windows Server 2012 R2 servers as I have been told they will have to be Server 2012 Standard boxes? Not sure if there was a 32-bit - 64-bit OS conflict between Server 2003 and Server 2012?
Also, is it OK for me to install the Exchange 2010 roles onto the 5 servers whilst the 2 networks are separate, and then when bridging the two networks together for coexistence and mailbox migration will the 2 environments automatically start talking, or will I have do initiate the process?
In advance thank you for the support.