Topic Last Modified: 2010-04-28

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager monitors the Windows Application log on computers running Exchange 2010 and generates this alert when the events specified in the following Details table are logged.

To learn more about this alert, in Operations Manager, do one or more of the following:


Product Name


Product Version

14.0 (Exchange 2010)

Event ID


Event Source


Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Mailbox/System Attendant

Rule Name

The MSExchangeAL service logged an unexpected exception. The exception is specified in the event description.


This alert event may be triggered by multiple causes.

  • Event 8331 indicates that the Address List Service cannot stamp Exchange attributes on Active Directory objects. When this event is being logged, users may not appear in the global address list (GAL). Additionally, users may not be able to access their Exchange mailboxes. These GAL display problems and mailbox access problems may occur if an internal class incorrectly processes certain threads that run at the same time.

  • Event 8142 is generated by code that can be called from other processes. It is the responsibility of the calling process to handle the exception. Similarly, the method by which you resolve this error varies greatly depending on what triggered this event in your particular Exchange environment.

User Action

To resolve this event, do one or more of the following:

  • Review the Application log for related events. For example, events that occur immediately before and after this event may provide more information about the root cause of this error.

  • Examine the server for a dump file produced by Dr. Watson, the Windows Server default debugger.

If you are having difficulty resolving the issue, contact Microsoft Product Support. For information about contacting support, visit the Contact Us page of the Microsoft Help and Support Web site.

For More Information

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.