To update the DAG members with new patches the process should be managed to prevent all of the DAG members from being offline at the same time.
You can move the active mailbox databases off a particular server so that it can be patched, and if necessary rebooted, without causing any downtime for mailbox users on that database.
Exchange Server 2010 Service Pack 1 introduced a new method for exporting mailboxes called Mailbox Export Requests. This new method replaces the previous Export-Mailbox command.
Before we look at how to create a new mailbox export request in Exchange 2010 SP1 there are a few things that you should understand.
While you can perform granular assignments in Exchange 2010, there are also Predefined Role Groups that you can use if you want an easier way of assigning permissions to end users.