The Microsoft 365 Status Twitter account has tweeted that this is being caused by new update and that they are investigating the issue. In an incident status message in the Microsoft 365 Admin Center titled ‘EX218604: Users experiencing Outlook connection issues and crashes’, Microsoft suggests users use web and mobile clients until the issue is resolved.
Faulting application name: OUTLOOK.EXE, version: 16.0.13001.20266, time stamp: 0x5ef262ee Faulting module name: mso98win32client.dll, version: 0.0.0.0, time stamp: 0x5ef2aa2d Exception code: 0xc0000005 Fault offset: 0x000474b2 Faulting process id: 0x4cf0 Faulting application start time: 0x01d65ac9b0e13874 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\mso98win32client.dll Report Id: 908e152f-636f-4f5a-9717-48a5576b3ccd Faulting package full name: Faulting package-relative application ID:
How to fix the Microsoft Outlook crashesIf Microsoft Outlook is crashing for you, you can resolve the issue by either starting Microsoft Outlook in Safe Mode or rolling back to a previous version of Microsoft Outlook.
Method 1: Roll back Microsoft Office to latest June 2020 release
To roll back to the June 24, 2020, release and fix the Microsoft Outlook crashes, please follow these steps:
- Open a command prompt by clicking on the Start Menu and typing CMD. When the ‘Command Prompt’ result appears, click on it.
- In the command prompt type
cd "\Program Files\Common Files\microsoft shared\ClickToRun"and press enter.
- You will now be in the ClickToRun folder. Type
officec2rclient.exe /update user updatetoversion=16.0.12827.20470and press enter.
- Microsoft Office will now download the specified version of Microsoft Office and roll back to that previous version. Please be patient as this may take a few minutes or longer, depending on your computer and Internet connection speed.
- When the updates are finished installing, you will be shown a screen stating ‘Updates were installed.’ You can press the Close button on this screen.
- Microsoft Outlook will now be rolled back to the previous version, and you should be able to start Microsoft Outlook again.
- You can now close the Command Prompt by clicking on the X button.
officec2rclient.exe /update user updatetoversion=16.0.12527.20880command instead to resolve the issue.
Method 2: Start Microsoft Outlook in Safe ModeIf you do not want to roll back to a previous version of Microsoft Office, you can launch Microsoft Outlook in Safe Mode to fix the crashes. It should be noted that when starting Outlook in Safe Mode, all add-ins will be disabled, including security add-ins. To start Outlook in Safe Mode, please follow these steps:
- Press and hold the Ctrl key on your keyboard and then launch Microsoft Outlook. Outlook will proceed to start and then ask if you are sure you wish to start in safe mode.
- You should now press the Yes button and Outlook will start in Safe Mode with add-ins disabled.
- Once Outlook starts, you can confirm you are in Safe Mode, as the title of the Outlook window will state “Microsoft Outlook (Safe Mode)”, as shown below.
- When done using Outlook, you can simply close the program.