We are planning an upgrade to Exchange 2010 from 2007. Currently we have a server running HUB, CAS, and Mailbox and another running mailbox services. The Server running only mailbox services, has all mailboxes, runs on a 2008 Server. The idea is to migrate the 2007 HUB, CAS and Mailbox Server to an Exchange 2010 Server. Both 2007 servers have Exch SP2 installed.
My question is: Can I migrate the 2007 HUB, CAS Mailbox to a 2010 Exchange server with the same services, and have the 2007 Mailbox server function properly with the new server?