We have 2 2003 Exchange servers presently, one in Canada and one in the States. They are both front end servers, we didn't want the redundancy as the connection couldn't handle the replication.
Our reseller in the states has told me that to upgrade to 2010, I will need 2 Exchange servers in the US. Is this really true? Does the CAS have to run seperately from the other roles? We only have 50 users on the box in the states, and 40 on the box in Canada. We also want to add an additional box in the UK that would hold 65 users.