Topic Last Modified: 2009-05-26

The Microsoft® Exchange Analyzer Tool includes a performance data collection engine that is used to query performance counter objects on computers that are running Exchange 2000 Server, Exchange Server 2003, or Exchange Server 2007. The performance data collection engine collects data from the RPC Client Backoff/sec and Client: RPCs Failed: Server Too Busy/sec performance counters of the MSExchangeIS performance object to analyze performance data.

Exchange Analyzer generates a warning if it determines that either of the following conditions occurred during the sample time slice:

To address this warning, follow these steps and this guidance to determine the root cause, and then address the issue as appropriate:

For more information about the MSExchangeIS\RPC Client Backoff/sec and MSExchangeIS\Client: RPCs Failed:Server Too Busy/sec performance counters, see "Monitoring Mailbox Servers" (

For more information about how to troubleshoot slow RPC request processing issues, see "Troubleshooting Slow RPC Request Processing Issues" (

For more information about Exchange 2007 performance issues, see "Exchange 2007 Performance Issues" (

For more information about how to monitor Exchange server performance, see "Monitoring Server Performance" (