My new white paper on CCR vs. SCC is now available!!
High Availability Choices for Exchange Server 2007: Continuous Cluster Replication or Single Copy Clustering can be found on 3Sharp's Notable Accomplishments page, or downloaded directly from the link I've provided. Here's a quick synopsis of the paper:
With today's reliance on e-mail services, the need for highly available systems where messaging services must be accessible at all times has become more apparent, and organizations are making significant investments in their messaging systems. Many organizations have come to the conclusion that redundancy is the only reliable way to keep e-mail services continuously available to their users. Exchange Server 2007 includes numerous high availability options that provide continuity of service and redundancy to help ensure messaging services are always up and operational. This whitepaper describes the benefits of Cluster Continuous Replication (CCR) for Exchange Server 2007, in contrast with Single Copy Clustering (SCC), and details the advantages and disadvantages of each.