Sequence of Exchange 2010 upgrade
Posted on 2009-12-21
Currently we have an ISA 2006 nlb cluster in a DMZ that forwards client requests to an Exchange 2003 OWA nlb cluster which then forwards to an Exchange 2003 active\passive cluster:
Remote client--> ISA 2006 nlb---> OWA nlb--> Exchange backend.
In transitioning to exchange 2010, should I install Exchange 2010 mailbox servers first, or start with installing Exchange 2010 CAS servers ? I don't plan on keeping mailbox and CAS roles on the same machine.