The VCS database agent for Exchange detects a failure in case of a system failure or if the Exchange Mailbox Server becomes unavailable on a node. VCS moves the mailbox databases configured on that node to the next available cluster node in the service group's system list. The agent also starts the critical Exchange 2010 services on that node, if required. The databases then become active on the new node. The client requests are then handled by the Mailbox Server on the new node, thus maintaining continuous availability of the Exchange 2010 mailbox databases.

This section describes how the agents migrate Exchange Server to another node in local clusters and in global disaster recovery environments.