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

OABGen detected that the file in the distribution point is corrupted or missing. This OAB will not be published.


This Error event indicates that one or more version 4 offline address book (OAB) files are corrupted or missing. Microsoft Outlook clients cannot download the updated files.

User Action

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

  • If daily backups are available, restore the content of the OABGen folder to the <ExchangeInstallDir>\ExchangeOAB\<OAB GUID> folder (where <ExchangeInstallDir> is the Exchange 2010 installation directory and <OAB GUID> is the name of the OABGen folder).

  • If the corrupted OAB item is enabled for public folder distribution and the data has been published to public folders before the OAB item was corrupted, you can delete the contents of the OABGen folder from the <ExchangeInstallDir>\ExchangeOAB\<OAB GUID> folder and rebuild the OAB files by updating the OAB. For more information about how to update the OAB, see Update the Offline Address Book.

  • If neither daily backups nor public folder distribution is enabled, delete the contents of the OABGen folder from <ExchangeInstallDir>\ExchangeOAB\<OAB GUID>, and then rebuild the OAB files by running the following Exchange Management Shell command:

    Copy Code
    Update-OfflineAddressBook <OABGuid>
    This command will cause a full OAB download by all clients. A full OAB download can cause considerable network traffic between Client Access servers and clients.

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.