While Exchange has no native features that provide for replication of information stores across servers, there are third-party products that do provide this functionality:
DoubleTake http://www.sunbeltsoftware.com/product.cfm?id=111 Check out this Microsoft Webcast which mentions DoubleTake...
See also, other options which include:
Microsoft Cluster Services
Dig Deeper on Microsoft Exchange Server Sync and Replication Issues
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