We are preparing to transition to Exchange 2010 from 2003 in a 2 domain forest. Our current setup in 2003 has 3 administrative groups, one of those being for the second domain.
As an example:
As I understand with 2010, email routing uses AD Sites instead. We will have 2 CAS servers, one to route email for the folks in Domain1 and another for the folks in Domain2. Currently in AD, the folks in ADMING1 and ADMING3 are in the same AD Site.
Do I need to split ADMING3 folks off to their own site for routing to work correctly? or can they both be part of the same site.