Is there any difference between doing a manual "Server Switchover" versus allowing the Mailbox Database to automatically failover to a passive copy in a DAG?
Technet article explains both and states that during a server failover for server hardware maintenance that "A passive database copy will be in the state that existed at the time when the system was shut down." http://technet.microsoft.com/en-us/library/dd298067(v=exchg.141).aspx
Is it possible to affect any client OWA, ActiveSync in even the smallest way for example if they had a draft open in Webmail for example?
If not what would be the reason to ever initiate a manual switchover prior to restarting a Mailbox Server?