Microsoft Exchange Performance Counters

Microsoft Exchange Mailbox Server Client Activity counters

The following table shows client activity counters.

Counter Name	Description
MSExchangeIS\Client: RPCs Failed:Server Too Busy
MSExchangeIS\Client: RPCs Failed:Server Too Busy/sec	Shows the client-reported rate of failed RPCs (since the store was started) due to the server too busy ROC error.
MSExchangeIS\RPC Client Backoff/sec	Indicates the rate at which client backoffs are occurring. Higher values may indicate that the server may be incurring a higher load resulting in an increase in overall averaged RPC latencies, causing client throttling to occur. This can also occur when certain client user actions are being performed. Depending on what the client is doing and the rate at which RPC operations are occurring, it may be normal to see backoffs occurring.