You can look up build numbers at Version numbers of update branches for Office 365 clients. Replace xxxx.yyyy with the build number you want to revert to. If you are using Outlook 2016, 2019, or 365, copy the following line, then right click in the command prompt window to paste it. If you don't see Command Prompt on the menu, you'll need to type cmd on the Start screen to find the Command Prompt then right click on it and choose Run as Administrator
Older Windows version: Right click on the Start button and choose Command Prompt (Admin).
Windows 10: Start typing cmd on the Start screen in the task bar search field to find the Command Prompt then click Run as Administrator Now you’re ready to roll back the click-to-run installation. In many cases, the “bad” file will be removed or replaced with a corrected update, and you can allow Office to install updates without reinstalling 'trouble' after a few weeks have passed. Next, create an appointment in your calendar for 30 days from now to remind yourself to check for updates. In Outlook (this is an Outlook help site after all), go to File, Office Account, Update Options and click on Disable Updates. You can disable updates from the File menu in any Office application.
If you don’t disable updates, the problem update will reinstall itself. First, you need to disable Office updates.
