Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2007-05-03

There are many performance counters that can be used to maintain and troubleshoot a computer that is running Microsoft Exchange Server 2007 that has the Unified Messaging (UM) server role installed. Unified Messaging performance counters are used to measure quantities of information or data for Unified Messaging based on the number, size, duration, and rate of data that is being requested or received.

Subscriber Access Performance Counters

Table 1 provides a list of the subscriber access performance counters that can be used to monitor Unified Messaging.

Table 1 Unified Messaging subscriber access performance counters

Performance counter	Performance object	Description
Average Recent Sent Voice Message Size	MSExchangeUMSubscriberAccess	Average Recent Sent Voice Message Size is the average size, in seconds, of the last 50 voice messages that were sent.
Average Recent Subscriber Call Duration	MSExchangeUMSubscriberAccess	Average Recent Subscriber Call Duration is the average length of time, in seconds, that subscribers spent logged on to the system for the last 50 subscriber calls.
Average Sent Voice Message Size	MSExchangeUMSubscriberAccess	Average Sent Voice Message Size is the average size, in seconds, of voice messages that are sent. This size does not include any attachment data.
Average Subscriber Call Duration	MSExchangeUMSubscriberAccess	Average Subscriber Call Duration is the average duration, in seconds, that subscribers spent logged on to the system. This timer starts when logon completes.
Calendar Accessed	MSExchangeUMSubscriberAccess	Calendar Accessed is the number of times subscribers accessed their calendars by using the telephone user interface.
Calendar Items Details Requested	MSExchangeUMSubscriberAccess	Calendar Items Details Requested is the number of times a subscriber requested additional details for a calendar item.
Calendar Items Heard	MSExchangeUMSubscriberAccess	Calendar Items Heard is the number of Calendar items that have been heard by authenticated subscribers.
Calendar Late Attendance	MSExchangeUMSubscriberAccess	Calendar Late Attendance is the number of messages that have been sent to inform the organizer of a meeting that the subscriber will be late.
Called Meeting Organizer	MSExchangeUMSubscriberAccess	Called Meeting Organizer is the number of times subscribers called the meeting organizer.
Calls Disconnected by Callers During UM Audio Hourglass	MSExchangeUMSubscriberAccess	Calls Disconnected by Callers During UM Audio Hourglass is the number of calls in which the caller disconnected while UM was playing the audio hourglass tones.
Calls Disconnected by UM on Irrecoverable External Error	MSExchangeUMSubscriberAccess	Calls Disconnected by UM on Irrecoverable External Error is the total number of calls that have been disconnected after an irrecoverable external error occurred.
Contacts Accessed	MSExchangeUMSubscriberAccess	Contacts Accessed is the number of times subscribers accessed the Main Menu Contacts option by using the telephone user interface.
Contact Items Heard	MSExchangeUMSubscriberAccess	Contact Items Heard is the number of times authenticated subscribers listened to directory details.
Directory Accessed	MSExchangeUMSubscriberAccess	Directory Accessed is the number of times subscribers accessed the Main Menu Directory option by using the telephone user interface.
Directory Accessed by Dial by Name	MSExchangeUMSubscriberAccess	Directory Accessed by Dial by Name is the number of directory access operations where the subscriber used the Dial by Name feature.
Directory Accessed by Extension	MSExchangeUMSubscriberAccess	Directory Accessed by Extension is the number of directory access operations in which the user supplied the extension number.
Directory Accessed by Spoken Name	MSExchangeUMSubscriberAccess	Directory Accessed by Spoken Name is the number of directory access operations in which the subscriber spoke a recipient name.
Directory Accessed Successfully by Dial by Name	MSExchangeUMSubscriberAccess	Directory Accessed Successfully by Dial by Name is the number of Dial by Name directory access operations completed successfully on behalf of users.
Directory Accessed Successfully by Spoken Name	MSExchangeUMSubscriberAccess	Directory Accessed Successfully by Spoken Name is the number of speech recognition directory access operations that completed successfully on behalf of subscribers.
Email Message Queue Accessed	MSExchangeUMSubscriberAccess	Email Message Queue Accessed is the number of times subscribers accessed their e-mail message queue by using the telephone user interface.
Email Messages Deleted	MSExchangeUMSubscriberAccess	Email Messages Deleted is the number of e-mail messages that were deleted by authenticated subscribers.
Email Messages Heard	MSExchangeUMSubscriberAccess	Email Messages Heard is the number of e-mail messages that have been heard by authenticated subscribers.
Forward Messages Sent	MSExchangeUMSubscriberAccess	Forward Messages Sent is the number of messages that have been forwarded by authenticated subscribers.
Launched Calls	MSExchangeUMSubscriberAccess	Launched Calls is the number of subscriber calls that resulted in an outbound call being placed.
Meetings Accepted	MSExchangeUMSubscriberAccess	Meetings Accepted is the number of Meeting Accepted messages sent by subscribers.
Meetings Declined	MSExchangeUMSubscriberAccess	Meetings Declined is the number of Meeting Declined messages sent by subscribers.
Replied to Organizer	MSExchangeUMSubscriberAccess	Replied to Organizer is the number of times subscribers sent reply messages to meeting organizers.
Reply Messages Sent	MSExchangeUMSubscriberAccess	Reply Messages Sent is the number of replies sent by authenticated subscribers.
Subscriber Authentication Failures	MSExchangeUMSubscriberAccess	Subscriber Authentication Failures is the number of authentication failures that have occurred since the service was started. This number is incremented once for every failed authentication. It is possible that a single phone call could generate several authentication failures.
Subscriber Logon Failures	MSExchangeUMSubscriberAccess	Subscriber Logon Failures is the number of logon failures since the service was started. This number is incremented at most once per phone call.
Subscriber Logons	MSExchangeUMSubscriberAccess	Subscriber Logons is the number of successful authentications by UM subscribers since the service was started.
Voice Message Queue Accessed	MSExchangeUMSubscriberAccess	Voice Message Queue Accessed is the number of times subscribers accessed their voice message queues by using the telephone user interface.
Voice Messages Deleted	MSExchangeUMSubscriberAccess	Voice Messages Deleted is the number of voice messages that were deleted by authenticated subscribers.
Voice Messages Heard	MSExchangeUMSubscriberAccess	Voice Messages Heard is the number of voice messages played to subscribers. This count is incremented as soon as playback starts. The subscriber does not need to listen to the entire message.
Voice Messages Sent	MSExchangeUMSubscriberAccess	Voice Messages Sent is the number of voice messages that have been sent by authenticated UM subscribers.

For More Information

For more information about performance objects and counters that are available for Unified Messaging, see Performance Counter Reference for Unified Messaging.
For more information about how to troubleshoot a Unified Messaging server, see Unified Messaging Server Issues.