A. Surprisingly, DAGs are available both in the standard and enterprise editions of Exchange 2010. However, you always need to install Exchange on the enterprise edition of Windows Server 2008 for failover cluster support.

Note that although you can do DAG with the standard edition of Exchange 2010, you'll be limited to five databases (the enterprise edition supports 100 databases), so the standard edition will only be useful for smaller environments.

Also note that you can mix standard and enterprise editions of Exchange 2010 in the same DAG. You could, potentially, use the standard edition to host the mailboxes for users at a remote site and then replicate them back to the central Exchange mailbox servers.

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