Microsoft Exchange Performance Counters

Microsoft Exchange Unified Messaging Performance and Scalability counters

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: MSExchangeUMAvailability

Counter Name	Description
% of Failed Mailbox Connection Attempts Over the Last Hour
% 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.
% 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.
% 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.
% of Partner Voice Message Transcription Failures Over the Last Hour	Shows the percentage of voice messages for which transcription failed in the last hour.
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.
Calls Disconnected on Irrecoverable Internal Error	Shows the number of calls disconnected after an internal system error occurred.
Directory Access Failures	Shows the number of times that attempts to access Active Directory failed.
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.
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.
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.