OL2002: Error Message: The Add-in "C:\Program Files\Microsoft Office\MbsExtn.dll" Could Not Be Installed or Loaded (320864)


The information in this article applies to:

  • Microsoft Outlook 2002
  • Microsoft Outlook 2000
This article was previously published under Q320864

SYMPTOMS

If you start Outlook 2000, you may receive the following error message:
The add-in "C:\Program Files\Microsoft Office\MbsExtn.dll could not be installed or loaded.

CAUSE

This behavior may be caused by the Network Associates GroupShield antivirus software.

RESOLUTION

To resolve this behavior, remove and reinstall the GroupShield add-in. To do this:
  1. Click Start, and then click Search.
  2. In the Search Results dialog box, click All files and folders.
  3. In the All or part of the file name box, type Mbsextn.dll, and then press ENTER.
  4. After the Mbsextn.dll file is located, right-click the file, and then click Rename.
  5. Type Mbsextn.dll.old, and then press ENTER.
  6. Close the Search Results dialog box.
  7. Start Microsoft Outlook.
  8. On the Tools menu, click Options.
  9. In the Options dialog box, click the Other tab.
  10. Click Advanced Options, and then click Add-In Manager.
  11. In the Add-In Manager dialog box, click to clear the GroupShield check box, and then click OK three times.
  12. Close Outlook.
  13. Start Outlook.
  14. On the Tools menu, click Options.
  15. In the Options dialog box, click the Other tab.
  16. Click Advanced Options, and then click Add-In Manager.
  17. In the Add-In Manager dialog box, click to select the GroupShield check box, and then click OK three times.
  18. Close Outlook.

MORE INFORMATION

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

For information about how to contact Network Associates Inc., click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:

65416 Hardware and Software Third-Party Vendor Contact List, A-K

60781 Hardware and Software Third-Party Vendor Contact List, L-P

60782 Hardware and Software Third-Party Vendor Contact List, Q-Z

Modification Type:MinorLast Reviewed:1/7/2006
Keywords:kberrmsg kbprb KB320864
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