We recommend that you make a complete backup of the clustered mailbox server prior to upgrading to Exchange 2007 SP1 and again after successfully completing the upgrade to Exchange 2007 SP1.
To perform this procedure, the account you use must be delegated membership in the Exchange Server Administrator role. For more information about permissions, delegating roles, and the rights that are required to administer Exchange 2007, see Permission Considerations.
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Performing this procedure results in a brief outage during the upgrade process. Exchange Setup /m:upgrade should be run only on the passive node in the cluster. Setup /UpgradeCms must be run on the active node. Both nodes need to be updated to Exchange 2007 SP1 to be supported, but you must upgrade the nodes one at a time. After each node has been upgraded, the clustered mailbox server is upgraded, and then brought online.
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In the following procedure, the designations of the active and passive node change. Therefore, for ease of reference in the following procedure, the original active node is NodeA and the original passive node is NodeB.