Q: Is a Windows Server 2003
and Windows Server 2008
mixed-cluster possible?
A: No. Windows Server 2008 introduces
a lot of clustering changes, including
Kerberos authentication, no support for
parallel SCSI, and a completely modified
API that renders Server 2008 clustering
incompatible with Server 2003
clustering. There are no rolling upgrades
to move a cluster from Server 2003 to
Server 2008.
—John Savill