You may install Office 365 applications on 15 devices in total: 5 installations on Windows (Windows 7, 8.1, or 10) and Mac (macOS/X 10.10 or later) devices, 5 installations on smart phones, and 5 on tablet devices. If you find you need to install on another computer, you must first deactivate a license.
To see which computers you have activated Office 365 on and select the computer to deactivate, do the following:
- Log in to Outlook Web App (OWA) on your Windows or Mac computer.
- Click on your profile icon in the right corner (this may have your initials or be a profile picture).
- Click My Account in the menu that opens.
- Click on View apps & devices.
Click the appropriate Sign out link to deactivate the license for the specified computer.
Deactivation does not actually uninstall Office from a computer. Office is still installed on the computer, but the Office applications are placed in reduced functionality mode.