Outlook 2016 crashing when using Options or More Commands…

Error Message:
The file Mso98Win32Client.dll is incompatible with Microsoft Outook. Install Outlook again.

Office 2016 Click-to-Run Version 1705 (Build 8201.2207) was released in November 2017 and caused Outlook to crash with the above error message when using the File > Options menu or using the Quick Access Toolbar and selecting More Commands… menu. This is a known issue from Microsoft: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_winother-mso_o365b/the-file-mso98win32clientdll-is-incompatible-with/810a274b-fa94-4e49-bb1c-49ab7df4a579

Easiest solution I found was to just update to the latest or previous version. You can do this using command line on the affected machines or updating the Office Deployment Tool and running the installer over the current install. I am using the next build in line with the Deferred Channel (aka Semi-Annual Channel as of January 2018), 8201.2209 from Nov 24, 2017.

  • Command Line (in As Administrator command prompt):
    • cd %programfiles%\Common Files\Microsoft Shared\ClickToRun
    • officec2rclient.exe /update user updatetoversion=16.0.8201.2209
  • Office Deployment Tool:
    • Using your script or command to update your Office Deployment Tool software.
    • Goo into the folder that houses your tool under Office > Data and check if you have the correct build files there.
      • They will show as v64-16.0.8201.2209.cab along with a matching folder. The 32-bit version will start with v32 instead of v64.
    • Once it is updated, just run the script or command you use to deploy to install over the currently installed version and you will be updated.


Notes for those seeing newer version but it is not installing: If you are seeing other version like 1708 and 1710, that is probably because you are on the Monthly or Semi-Annual Channel (Targeted) branches. They updated faster than deferred, but business accounts are a few months behind. As long as you can update passed V1705 B8201.2207, you should be set. More info here: https://support.office.com/en-us/article/Version-and-build-numbers-of-update-channel-releases-ae942449-1fca-4484-898b-a933ea23def7

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