I received an email stating the following:
Microsoft Cluster Server is supported with VMware ESX 3.5 Update 1. Support is similar to ESX 3.0.1 with the following additions:
- Both 64 bit and 32 bit Windows 2003 guests are supported with MSCS.
- Boot from SAN for VMs using MSCS is now supported.
- Majority Node Set clusters with application-level replication (for example, Microsoft Exchange 2007 Cluster Continuous Replication (CCR)) is now supported.
For details regarding MSCS support, including a number of important restrictions, please see the document “Setup for Microsoft Cluster Service.” For information concerning supported storage arrays, refer to the Storage/SAN Compatibility Guide for ESX Server 3.5 and ESX Server 3i.