Clustering made simpler and more reliable: Exchange 2000/2003 clustering required servers in the cluster nodes to share the same physical data. The clustering in Exchange Server 2000/2003 provided application level redundancy for Exchange Server but not for the Exchange data. Thus, the data could be regarded as a single point of failure. Exchange Server 2007 introduces new cluster terminology and configurations that address the shortcomings of the previous shared data model
CCR: Exchange Server 2007 provides built-in support for asynchronous replication modelled on SQL Server's "Log Shipping". Continuous Cluster Replication (CCR) clusters are built on MSCS MNS (Microsoft Cluster Service - Majority Node Set) clusters which do not require shared storage. This type of cluster can be relatively inexpensive and deployed in one location, or "stretched" across two data centres for protection against site wide failures such as natural disasters and air conditioning failure.
SCR: Note, Exchange 2003 SP1 (due soon) will introduce the concept of Standby Continuous Replication (SCR) whereby data can be replicated from the live Exchange 2007 server to a standby server. This standby server can be in the same datacentre or at a remote location, and replication can take place over a WAN. If the primary Exchange server or indeed whole datacenter fails, the standby server can be quickly manually activated.
Improved protection: anti-spam, antivirus, compliance, clustering with data replication, improved security and encryption
Improved IT Experience: 64-bit performance & scalability, command-line shell & simplified GUI, improved deployment, role separation, simplified routing
Improved User Messaging Experience: improved calendaring, unified messaging, improved mobility, vastly improved Outlook Web Access
We recommend deploying Microsoft Exchange Server 2007 with Microsoft Internet Security and Acceleration (ISA) Server 2006. ISA 2006 and Microsoft Exchange Server 2007 are designed to work together to provide a more secure messaging environment
for client access.
See Microsoft's offical ten reasons to deploy Exchange 2007 here
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