When planning the hardware and system requirements for your clustered Microsoft Exchange Server computers, see Microsoft Exchange Server Getting Started and your Microsoft Cluster Server documentation.
If you are using Microsoft Exchange Server in a clustering environment, you must install the hot fixes available from ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postsp3/roll-up/ before you install Microsoft Exchange Server.
Note The Hardware Compatibility List for Microsoft Cluster Server is available on the Web at http://www.microsoft.com/hwtest/hcl/.