Office Applications crash or cannot start


This article only addresses the crash scenario where mso30win32client.dll is the module name in a crash signature.

For other scenarios, see the following articles:

If you still couldn't find a solution with Office Applications crashing or not starting, you might check the Microsoft Community Office Commercial Admin Center Forums.


Microsoft Office 2016 applications may crash or cannot start. The applications that have been seen to be affected are Excel, Outlook, Skype for Business, Word, Access, Publisher, Project and OneNote.

Additionally, in the Application Event log, you may find a crash signature similar to the following in event ID 1000:

Application Name: <application>.exe
Application Version:16.0.4266.1001
Module Name: mso30win32client.dll
Module Version: 16.0.4266.1001
Offset: <varies>


  • The Application Name will be the name of the executable of the application, such as excel.exe, outlook.exe, lync.exe, winword.exe, msaccess.exe, mspub.exe, winproj.exe, or onenote.exe.
  • The Application Version, Module Version and Offset will vary.



Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.

To work around this issue, follow these steps:

  1. Exit all Office 2016 applications.

  2. Start Registry Editor. To do this, use one of the following procedures, as appropriate for your version of Windows.

    • Windows 10, Windows 8.1 and Windows 8:Press Windows Key + R to open a Run dialog box. Type regedit.exe and then press OK.
    • Windows 7: Click Start, type regedit.exe in the search box, and then press Enter.
  3. Locate and then select the following registry key:


  4. Locate the ShownFirstRunOptin registry value in the key that is specified in step 3. If you do not find ShownFirstRunOptin, go to step 5. If you do find it, go to step 7.

  5. If you do not find the ShownFirstRunOptin registry value, point to New on the Edit menu, and then click DWORD (32-bit) Value.

  6. Type ShownFirstRunOptin, and then press ENTER.

  7. Right-click ShownFirstRunOptin, and then click Modify.

  8. In the Value data box, type 1, and then click OK.

  9. On the File menu, click Exit to exit Registry Editor.