What are Microsofts plans for supporting Microsoft Exchange Server on MSCS clusters?
Microsoft will support the Enterprise Edition of Microsoft Exchange Server on MSCS clusters. Exchange Server 5.5 Enterprise Edition provides “active/passive” failover on an MSCS cluster. This means Exchange Server 5.5 Enterprise Edition is able to run on one server in the cluster at a time, and MSCS will be able to automatically restart Exchange Server on the other server following an application or server failure. Future versions of Exchange Server will be enhanced for active/active failover (for example, ability to run Exchange Server simultaneously on both servers).