When you update a DAG server from Exchange 2010 RTM to Exchange 2010 SP1 you should see the Event ID 1185 in the application event log file. This event will only be logged in the application event log file if there is a database schema update that requires to change/update the Exchange mailbox database. Otherwise you will not see this event. When you update from SP1 to SP2 the event will not be logged in the application event log file, because there was no database schema update with this requir
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