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MS Server 2008 handles virtualization and failover clustering

Hi, I have a several part question.  We acurrently have a single file server and a single exchange server, both running MS server 2003.  How well does MS Server 2008 handle virtualization and then combine that with failover clustering?  Would it be fesible to try and run both the file server and exchange server on a slice of a virtural server, then cluster them to a backup server?  We currently have about 100 users and are looking at options as we replace our older servers.  How would we have to configure the roles of exchange in a situation like this?  Would microsoft virtulazation handle this or would we need to go to VM Ware.  And on top of this all would it work with a SAN on the back end?
Thanks - Wayne
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Thanks for the reply.  I am still confused about the exchange part.  How many roles would we need to deploy as a minimum?  We will not be doing uinified communications.  Also, what is CCR?
Thanks - Wayne
CCR is Cluster Continuous Replication, an Exchange cluster technology that allows for a shared-nothing architecture (including no shared storage).

At a minimum you're going to need the Mailbox, Hub Transport and Client Access server roles for Exchange.

NOTE: If you decide to cluster Exchange (CCR) it requires the Enterprise editions of Windows and Exchange and the Mailbox server role cannot coexist with any other server roles.

Erik