Each Office 365 Personal subscription comes with Office installs for 1 Mac or PC and 1 tablet. If you run out of installs, you can deactivate one of them so you can install Office on a different computer or tablet.
Deactivate an Office install
On your account page, under Install Information, click Deactivate Install next to the name of the computer or tablet where you want to deactivate Office.
After you deactivate Office on one computer or tablet, you can install it on another.
When you deactivate an install, Office will run in read-only mode on that computer or tablet. That means you’ll be able to view and print documents but you won’t be able to edit them or create new ones. If you want to completely remove Office, you can.
Uninstall Office from a PC or Windows tablet
Uninstall Office from a Mac