http://blogs.msdn.com/douggowans/archive/2009/03/18/ccr-or-scc.aspxHave had this discussion on many occasions and this 3Sharp whitepaper by Missy Koslosky would have proved very useful as an external reference point… High Availability Choices for Exchange Server 2007: Continuous Cluster Replication or Single Copy Clusteringen-USCommunityServer 2.1 SP1 (Build: 61025.2)