office 365 overwriting my owned office 2016

To get rid of Microsoft 365 and go back to using an existing Office 2016 installation, remove Microsoft 365 from the PC and then reinstall/repair Office 2016 if needed.

1. Uninstall Microsoft 365 using the uninstall troubleshooter
   1. On the Windows 10 PC, run the Microsoft 365/Office uninstall troubleshooter: select the Uninstall button from this article: Can’t switch from Microsoft 365 to Office.
   2. When prompted, click Open if a pop‑up says This site is trying to open Get Help.
   3. Follow the prompts in the troubleshooter to remove Microsoft 365 from the PC.
   4. Restart the computer when prompted.
   Notes from the tool’s requirements:
   • It must be run on the same Windows PC that has Microsoft 365 installed.
   • It requires Windows 10 or higher.
2. If Office 2016 is no longer installed, reinstall it
   • After Microsoft 365 is fully removed, install or reinstall Office 2016 using the steps for Office 2016 in this article: Download and install or reinstall Office 2021, Office 2019, or Office 2016.
3. If Office 2016 is still installed but files open in Microsoft 365
   • After uninstalling Microsoft 365, Office 2016 should become the default for Word/Excel/PowerPoint files automatically. If not, repair or reinstall Office 2016 using the same Office 2016 article above, then re‑associate file types with Office 2016 via Windows settings.

If the uninstall troubleshooter does not completely remove Microsoft 365, follow the “manually uninstall Office” guidance linked from the same article.

References:

• Can’t switch from Microsoft 365 to Office