Topic Last Modified: 2010-04-29

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

A specific DLL cannot be loaded. Review the error in the event description for details about the specific DLL that could not be loaded.


This alert indicates that a dynamic link library file (.dll), which is one of the .dll files loaded by the Microsoft Exchange System Attendant service during startup, is either corrupted or not present.

  • Event 9002 indicates that the internal Recipient Update Service in the Microsoft Exchange System Attendant service failed to start. The Recipient Update Service is a component of the Microsoft Exchange System Attendant, and the code for the Recipient Update Service is in the ABV_DG.DLL file. When the Microsoft Exchange System Attendant starts, it loads several .dll files, and one of them is the ABV_DG.dll file. A failure to load the file and initiate the Recipient Update Service can result in this event.

    The Recipient Update Service is only required in organizations that contain both Exchange 2010 and Exchange 2003 servers. To learn more about running Exchange 2010 in a mixed environment, see Exchange 2003 - Planning Roadmap for Upgrade and Coexistence.
  • Event 9005 indicates that the OABGEN.dll file, which is one of the .dll files loaded by the Microsoft Exchange System Attendant service during startup, is either corrupted or not present. The error code is usually C007007E, which maps to ERROR_MOD_NOT_FOUND.

User Action

To resolve this alert, do one of the following:

  • To resolve event 9002:

    • Make sure that the ABV_DG.dll file is present in the location where the Exchange server is installed. This is typically the <Install Drive>:\Program Files\Microsoft\Exchange Server\Bin folder.

    • If the file is present, make sure that the file version is the same as the installed Exchange version.

    • Resolve your issue by using self-support options, assisted support options, and other resources. You can access these resources from the Exchange Server Solutions Center. From this page, click Self-Support Options in the navigation pane to use self-help options. Self-help options include searching the Microsoft Knowledge Base, posting a question at the Exchange Server forums, and others. Alternatively, in the navigation pane, you can click Assisted Support Options to contact a Microsoft support professional. Because your organization may have a specific procedure for directly contacting Microsoft Technical Support, be sure to review your organization's guidelines first.

  • To resolve event 9005, make sure that OABGEN.dll is present in the expected location. By default, this is the <Install Drive>\Program Files\Microsoft\Exchange Server\Bin folder.

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.