Why won’t Word, Excel, or PowerPoint open in Microsoft 365?

Hi there! When your Microsoft 365 apps suddenly stop opening, it's usually because something is a little corrupted or a recent update didn't go quite right. The good news is, there's a clear process to fix it, and you can usually do it yourself.

Start with the easiest and most effective fix first.

First, a Digital Tune-Up
The most common culprit is a corrupted file. Fortunately, you don't need to uninstall and reinstall everything. Microsoft has a built-in repair tool that can fix any broken files by replacing them.

On Windows:

Go to Settings > Apps > Installed apps.
Find your Microsoft 365 or Office in the list.
Click the three dots or right-click and select Modify.
Choose the Online Repair option. This is more thorough than the Quick Repair.

On Mac:

Just make sure all your Office apps are up to date. Open any one of them and go to Help > Check for Updates. Installing the latest patches often fixes these kinds of glitches.

If That Doesn't Work, Check for a Rogue Add-in.

If the repair doesn't solve it, the next likely culprit is a conflicting add-in. These are small programs that load when the app starts, and a buggy one can make the whole thing crash. You can test this by opening the app in Safe Mode, which bypasses all add-ins.

To open in Safe Mode:

Press the Windows key + R to open the Run dialog.
Type the command for the app: winword.exe /safe (Word), excel.exe /safe (Excel), or powerpnt.exe /safe (PowerPoint).

To disable them:

Inside the Safe Mode app, go to File > Options > Add-ins.
At the bottom of the window, next to "Manage," choose COM Add-ins and click Go.
Uncheck everything in the list, click OK, and close the app.
Now, try opening the app normally. It should work. If you need a specific add-in, you can go back and re-enable them one by one to find the one that was causing the trouble.

This two-step process usually gets to the bottom of the issue. Let me know if you have any questions or if you run into any trouble!