Topic Last Modified: 2010-05-03

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 failed to create the directory. One or more offline address books will not be published.


Error event ID 9375 or 9376 indicates that the offline address book (OAB) generation failed to create the directory for the OAB files (ExchangeOAB). The path to the ExchangeOAB share may be too long. It should not exceed 249 characters, and directory names cannot include the following symbols: \ / // : ? " < > |

User Action

To resolve error event ID 9375 or 9376, do one or more of the following:

Incorrectly editing the registry can cause serious problems that may require you to reinstall your operating system. Problems resulting from editing the registry incorrectly may not be able to be resolved. Before editing the registry, back up any valuable data.
  • Make sure the OABDropFolderLocation value in the registry is not pointing to a nonexistent location, the path is shorter than 249 characters, and the directory names do not include the following symbols: \ / // : ? " < > |

  • If the OABDropFolderLocation value in the registry does not exist or if the path exceeds 249 characters, create an empty directory in an alternative location and store the path to it in the following registry value:

    HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\MSExchangeSA\Parameters\OAB Folder Location

  • Restart the Microsoft Exchange System Attendant service (MSExchangeSA).

  • 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.

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.