How to upgrade an Microsoft Exchange 2007 CCR cluster from Service Pack 2 to Service Pack 3

When you’re going to upgrade your Micrososft Exchange 2007 CCR cluster environment to an Service Pack (in my example it is an Microsoft Exchange 2007 CCR cluster with Service Pack 2), but all these steps are the same in that case.

1.) First upgrade the CAS server(s)
2.) Then upgrade the HUB Transport server(s)
3.) Logon to the passive node
4.) Upgrade the passive node to Service Pack 3
 setup.com /mode:Upgrade
6.) Restart the server after the setup is completed succesfully
7.) Stop the CMS (Clustered Mailbox Server) on the active node (DOWNTIME!!)
 Stop-ClusteredMailboxServer MAILCLUSTER01 –StopReason “SP3 Upgrade”
8.) Move the CMS (Clustered Mailbox Server) to the passive node (DOWNTIME!!)
 Move-ClusteredMailboxServer MAILCLUSTER01 –TargetMachine CCR2 –MoveComment “SP3 Upgrade”
9.) On the passive node upgrade the CMS (Clustered Mailbox Server)
 setup.com /UpgradeCMS
10.) Bring the CCR cluster back online
 Start-ClusteredMailboxServer MAILCLUSTER01
11.) Upgrade the initial active node to Service Pack 3
 setup.com /mode:Upgrade
12.) Restart the server after the setup is completed succesfully
13.) Now you have an Exchange 2007 CCR cluster with Serivce Pack 3

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