Microsoft KB Archive/258180

= "A required .dll file, Mso9.dll, was not found" error message when you start Outlook 2000 =

Article ID: 258180

Article Last Modified on 8/13/2004

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APPLIES TO


 * Microsoft Outlook 2000 Standard Edition

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This article was previously published under Q258180



SYMPTOMS
When you start Microsoft Outlook, you may receive the following error message:

A required .DLL file, Mso9.dll, was not found.

Outlook does not start. You may also notice that all Microsoft Office applications do not start.



CAUSE
The Mso9.dll file is not on your computer.



RESOLUTION
To resolve this problem, you must reinstall Microsoft Office 2000. If you installed Outlook separately, just reinstall Outlook.
 * 1) Click the Start button, point to Settings, and then click Control Panel.
 * 2) In Control Panel, double-click Add/Remove Programs.
 * 3) In the list of programs, click either Microsoft Outlook 2000 or Microsoft Office 2000, depending on how you installed Outlook.
 * 4) Click Add/Remove.
 * 5) After Office Setup begins, click Repair Office.
 * 6) Click Repair errors in my Office 2000 installation, and then click Finish.

The repair process may take several minutes while Office Setup repairs any damaged or missing files. If you receive a prompt to restart your computer, click Yes.



MORE INFORMATION
Mso9.dll is a primary Office file. If the file is damaged or missing, all Office applications do not function correctly.

Additional query words: OL2K missing gone absent

Keywords: kberrmsg kbprb kbrepair KB258180

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