Outlook crash Faulting module name: mso40uiwin32client.dll / Ribbon button RRS feed

  • Question

  • Dear Community,

    I got the following error:

    Faulting application name: outlook.exe, version: 16.0.7167.2040, time stamp: 0x57ad490b
    Faulting module name: mso40uiwin32client.dll, version:, time stamp: 0x57ab7885
    Exception code: 0xc0000005
    Fault offset: 0x000ce501
    Faulting process id: 0x22e4
    Faulting application start time: 0x01d20e5613bb64ad
    Faulting application path: C:\Program Files (x86)\Microsoft Office\root\Office16\outlook.exe
    Faulting module path: C:\Program Files (x86)\Common Files\Microsoft Shared\Office16\mso40uiwin32client.dll
    Report Id: 260f5ed4-ef15-4920-a89e-296d1db1c02c
    Faulting package full name:

    Fault bucket 108348870667, type 1
    Event Name: APPCRASH
    Response: Not available
    Cab Id: 0

    Problem signature:
    P1: outlook.exe
    P2: 16.0.7167.2040
    P3: 57ad490b
    P4: mso40uiwin32client.dll
    P6: 57ab7885
    P7: c0000005
    P8: 000ce501

    Attached files:
    C:\Users\Developer\AppData\Local\Temp\{B35C3CFF-46A4-435D-A06E-D9115EF03D28} - OProcSessId.dat

    These files may be available here:

    Analysis symbol:
    Rechecking for solution: 0
    Report Id: 260f5ed4-ef15-4920-a89e-296d1db1c02c
    Report Status: 1
    Hashed bucket: 89b763c29ca8ae6cb85ee660312cb38f

    My system environment:

    Windows 10 Pro

    Outlook 2016

    Visual Studio 2015 Update 3

    I created a new Outlook Add-in Project.

    Create a RibbonType and set the type to Microsoft.Outlook.Explorer.

    Add a button to the file part of the ribbon.

    Execute the following code:


    privatevoidbutton1_Click(objectsender, RibbonControlEventArgse)




    This issue is reproducable just on Outlook 2016 on two different machines.

    How can I solve that? How can I contact the Microsoft developer Support?

    Regards Chris

    Wednesday, September 14, 2016 7:42 AM

All replies

  • Hi Chris,

    I made a test with your system environment, it works correctly at my side.

    When did your Outlook crash? Did it crash when you click the button1? If you click other built-in buttons, will it crash?

    I suggest you try How to: Show Add-in User Interface Errors to check whether there is any error in your Office Add-ins.

    To check whether it is related with other add-ins, I suggest you uncheck other add-ins in Com Add-ins.

    Best Regards,


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    Thursday, September 15, 2016 5:51 AM
  • Dear Edward,

    thanks a lot for your reply.

    I checked the box to show User Interface Errors without success.

    I already switched off all other Com Add-ins.

    That does not solve the issue either.

    Any other ideas?

    Regards Chris

    • Edited by Chris Kroos Thursday, September 15, 2016 11:40 AM More polite form.
    Thursday, September 15, 2016 11:39 AM
  • Hello Chris,

    It looks like something is wrong with your machine(s).  Do you have any antivirus software installed?

    BTW Did you try to repair MS Office?


    Thursday, September 15, 2016 2:47 PM