Microsoft has made continual updates to Exchange to make it easier to manage and configure. Service
Pack 1 addressed a large number of customer concerns with major feature improvements to the GUI as
well as PowerShell. They have also addressed the changing demands of companies that made email
grow from a little - used application to a business - critical application while making high availability
more affordable.
Single Copy Clusters
Single Copy Clusters (SCCs) are Microsoft Exchange Server 2007 ??™ s traditional approach to active/
passive clustering of mailboxes. In this release of Exchange only active/passive configurations are
supported. The active/active role is no longer supported; one passive node is always required in a
cluster. Also, the Mailbox role is the only role supported for deployment in a Microsoft Cluster
Service (MSCS) configuration. Clustering mailboxes, through SCC, provides a higher level of
uptime and availability to end users. If there is a hardware failure on one of the nodes in the
cluster, any resources that were on that node are relocated to another node in the cluster.
Individual nodes can be taken down for patching without disrupting the overall application
uptime to the client. This does not provide a 100 percent uptime guarantee, but will provide a
higher level of service over a standalone mailbox server.
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