Exchange can run on a server cluster. This technic is refered to as running a virtual server. You have two or more servers connected in a cluster, but the clients see only one.
For any info on exchange I can recommend www.petri.co.il. Daniel Petri is a MVP on exchange.
MCP (NT 3.51) MCSE (NT 4.0, 2000, 2003) MCSA (2000, 2003), MCT (since 1999), Vista, Exchange 2007, MCITP server 2008 server administrator, A+, Network+, Security+, CEH.
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