Performance and Scalability Counters for Unified Messaging

Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2

Topic Last Modified: 2010-11-16

The following table provides information about performance counters that are used by the Unified Messaging (UM) server role in Microsoft Exchange Server 2010. You can use Performance Monitor (perfmon.exe) to monitor these counters.

For more information, see Performance Monitor Getting Started Guide. For information about other counters relevant to Exchange 2010, see Performance and Scalability Counters and Thresholds.

Object	Counter	Description	Threshold	Troubleshooting
MSExchangeUMAvailability	% of Failed Mailbox Connection Attempts Over the Last Hour	Shows the percentage of mailbox connection attempts that failed in the last hour.	Should be less than 5%.
MSExchangeUMAvailability	% of Inbound Calls Rejected by the UM Service Over the Last Hour	Shows the percentage of inbound calls that were rejected by the Microsoft Exchange Unified Messaging service over the last hour.	Should be less than 5%.
MSExchangeUMAvailability	% of Inbound Calls Rejected by the UM Worker Process Over the Last Hour	Shows the percentage of inbound calls that were rejected by the UM worker process over the last hour.	Should be less than 5%.
MSExchangeUMAvailability	% of Messages Successfully Processed Over the Last Hour	Shows the percentage of messages that were successfully processed by the Microsoft Exchange Unified Messaging service over the last hour.	Should be greater or equal to 95%
MSExchangeUMAvailability	% of Partner Voice Message Transcription Failures Over the Last Hour	Shows the percentage of voice messages for which transcription failed in the last hour.	Should be less than 5%.
MSExchangeUMAvailability	Directory Access Failures	Shows the number of times that attempts to access Active Directory failed.	Should be 0 at all times.
MSExchangeUMAvailability	Calls Disconnected on Irrecoverable Internal Error	Shows the number of calls disconnected after an internal system error occurred.	Should be 0 at all times.
MSExchangeUMPerformance	Operations over Six Seconds	Shows the number of all UM operations that took more than six seconds to complete. This is the time during which a caller was waiting for UM to respond.	Should be 0 at all times.
MSExchangeUMCallAnswer	Calls Disconnected by Callers During UM Audio Hourglass	Shows the number of calls during which the caller disconnected while Unified Messaging was playing the audio hourglass tones.	Should be 0 at all times.	A nonzero value suggests excessive latency between a Unified Messaging server and targeted domain controller.
MSExchangeUMAvailability	Total Inbound Calls Rejected by the UM Service	Shows the total number of inbound calls that were rejected by the Microsoft Exchange Unified Messaging Service since the service was started.	Should be 0 at all times.
MSExchangeUMAvailability	Total Inbound Calls Rejected by the UM Worker Process	Shows the total number of inbound calls that were rejected by the UM Worker process since the service was started.	Should be 0 at all times.