EXPERT RESPONSE
VIEW MEMBER FEEDBACK TO THIS ASK THE EXPERT Q&A.
Setting up a second domain controller is a great idea for redundancy of your directory (and potentially your global catalog, assuming you enabled this on the second domain controller). But installing Exchange Server on a second domain controller does not give you any ability to replicate the mailbox content to the other Exchange server. Setting up two replicated instances of a given mailbox is not possible with Exchange 5.5, Exchange 2000 or Exchange 2003.
MEMBER FEEDBACK TO THIS ASK THE EXPERT Q&A:
Why not just mirror the Exchange drive?
—Gordon H.
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My understanding is that the user is looking to replicate mailbox content for redundancy reasons. Mirroring the drive would provide a level of redundancy but the ideal story around mailbox-level redundancy is the equivalent of either Exchange 2007 Local Continuous Replication (LCR) or Clustered Continuous Replication (CCR). Native solutions don't exist for Exchange 2003, however third-party solutions such as Double-Take provide alternatives.
—David Sengupta, Exchange Administration expert
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Exchange Admin 101: Exchange Server replication and synchronization
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Reference Center: Exchange replication and synchronization resources
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