Topic Last Modified: 2010-01-27

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

MSExchange ActiveSync

Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Client Access/ActiveSync

Rule Name

Exchange ActiveSync could not access a mailbox on a Mailbox server because the Mailbox server is offline.


This Warning event indicates that Microsoft Exchange ActiveSync tried to access a mailbox on a computer that has the Mailbox server role installed, but detected that the Mailbox server cannot handle requests. This may be caused by the following conditions:

  • A Microsoft Exchange database is dismounted.

  • The Mailbox server is offline for maintenance.

User Action

To resolve this event, consider the following:

  • If this event is logged infrequently, or only during scheduled downtime for a Mailbox server, no user action is required.

  • If this event is frequently logged, do one or more of the following:

    • Make sure that the databases on the Mailbox server are mounted.

    • Review the Application log on the Mailbox server to determine the root cause of the Mailbox server being offline.

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.