Topic Last Modified: 2009-11-20

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

OALGen is running on the wrong CCR cluster node. Only one node in the CCR cluster can generate OAB. OAB generation will not be performed.


This Warning event indicates that the Microsoft Exchange System Attendant service is running on an active cluster continuous replication (CCR) node, but the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeSA\Parameters\{ClusterMailboxServerName}\ EnableOabGenOnThisNode registry value is not set to this node name.

User Action

To resolve this Warning event, verify your cluster configuration and make sure that a released version of Microsoft Exchange Server 2007 is installed on all nodes. For more information about managing CCR, see Managing Cluster Continuous Replication.

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.