During an upgrade to Windows Advanced Server, Limited Edition or to Windows Server 2003, Datacenter Edition, clustered IIS resources fail
Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1
IIS 6.0 is not supported during rolling upgrades of server clusters. To upgrade a clustered IIS resource, you must replace the existing IIS resource with a Generic Script Resource. For instructions on how to do this, search for "generic script resource" in Help and Support Center for Windows Server 2003.