Cluster continuous replication (CCR) is a high-availability feature of Microsoft Exchange Server 2007 that combines the asynchronous log shipping and replay technology built into Exchange 2007 with the failover and management features provided by the Microsoft Windows Cluster service. This paper provides enterprise-level customers with the data required to effectively understand the options, as well as the limitations, of implementing this replication-based high-availability solution into their infrastructure. Includes lab data, performance information, and best practices based on HP Customer Focused Testing.