EXPERT RESPONSE
Unfortunately, there are no native Microsoft technologies to accomplish this. Depending on the distance between your servers and the specifics of the technologies you're using, you may find that a geo-cluster solution (i.e., NSI Double-take) or something like Marathon Technologies will meet your requirements. Or, simply explore active/passive clustering for Exchange. Have a read through Exchange Server 2003 cluster architecture to learn more.
How you set up your DNS will depend on which approach you take, whether you implement DNS load balancing (i.e., BigIP, round robin DNS, etc.) and what kind of firewall you're using.
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Related information from the TechTarget Windows Network:
SearchExchange.com Interview: Scott Schnoll Q&A: Clustering Exchange 2000
SearchExchange.com Reference Center: Replication and Synchronization
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