Applying Exchange Server 2003 Service Pack 1 (SP1) on a cluster is a little more complex than applying it on a nonclustered Exchange 2003 system. Here are the basic steps to follow and a Microsoft reference that can guide you in the process.
If you're installing Microsoft SQL Server 2000 on a Windows 2003 cluster, you also need to install Microsoft Distributed Transaction Coordinator (MS DTC). Here's how.
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