I understand that the method of using a "windows NLB" provide load balancing and not FT for connected mapi sessions. - ie the client would need to close outlook and reconnect.
argument/discussion at work from colleague is that Exchange 2010 has its own "native" CAS array tool to provide true FT.
and that I should have used it and this would have "automatically" failed over the mapi sessions without them closing and reopening outlook. (NOT a hardware load balancer) - I know of no such tool inside Exchange for CAS array. DAG for Database - yes. Were talking about CAS array not DAG
Am I wrong? I'm aware that MS don't recommend the windows NLB now - however at time of build they did. (so we went with it)
Is there a native Exchange method of providing Fault tolerance for 2 x CAS servers?