The 2003 Exchange cluster is being overload. The repair is only temporary until the load increases further. Adding a new server to the cluster will causing the load to subside. However in the mean time follow the destructions below Added registry key: HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\KeepAliveTime value is 600,000 (10 mins) http://support.microsoft.com/?id=934878 add the EnableAggressiveMemoryUsage registry entry...
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