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 these procedures, the account you use must be delegated the following:
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Membership in the Exchange Server Administrator role
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Local administrator permissions on all nodes in the cluster
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 should be run only on the passive nodes in the cluster. All nodes need to be upgraded to Exchange 2007 SP1 to be supported, but you must upgrade the nodes one at a time. After all nodes have been upgraded, the clustered mailbox server is upgraded, and then brought online.
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The following procedure performs an upgrade of a two-node cluster. If your SCC has more than two nodes, Steps 12-15 will be repeated multiple times. In the following procedure, the designations for the active and passive nodes change. Therefore, for ease of reference in the following procedure, the original active node is NodeA and the original passive node is NodeB.