Topic Last Modified: 2010-04-27

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


Alert Type


Rule Path

Microsoft Exchange Server/Exchange 2010/Mailbox/System Attendant

Rule Name

OABGen couldn't create a message to post in the public folder.


This Error event indicates that offline address book (OAB) %3 could not be posted to the system folders in the public folders used for legacy client compatibility. By default, Exchange Server 2010 does not install public folders unless it is added to an existing Exchange Server 2003 organization or the installer selects to support pre-Outlook 2007 clients.

User Action

To resolve this error, do one of more of the following:

  • Review the System and Application event logs 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.

  • Download and run the OABInteg tool at Description of the Offline Address Book Integrity ( OABInteg ) tool.

  • If you are using Outlook 2003 clients in your organization and require OABs to be distributed via public folders, you will need to create the public folder infrastructure by creating a public folder database on at least one Exchange 2010 Mailbox server. For more information, see Create a Public Folder Database.

  • If you don't have Outlook 2003 client in your organization and you don't require OABs to be distributed via public folders, make sure that your OABs are being distributed via the web-based distribution method. For more information, see Managing Offline Address Books.

  • If you cannot resolve this issue, or you experience other problems or mail flow interruptions in the Exchange environment, contact Microsoft Product Support Services. 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.