Subsequent performance issues with active-active mode have led Microsoft to recommend that it should no longer be used. They must wait, inactive, for the home servers in the node to fail. This is opposed to Exchange's more common active-passive mode in which the failover servers in any cluster node cannot be used at all while their corresponding home servers are active. In this setup, both servers in the cluster are allowed to be active simultaneously. Exchange Server 2003 also introduced active-active clustering, but for two-node clusters only.
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