Deactivate Office 365 if you see a "limit reached" error
If you have an Office 365 subscription, you can deactivate Office 365 on a PC or Mac that you're no longer using. Deactivating an Office 365 install doesn't uninstall Office, remove Office documents, or cancel your Office 365 subscription.
Note: Because this process is done through your web browser, you can deactivate an Office 365 install from any device.
If you're not sure whether your Office 365 version is for home or business, see Office plans.
Office 365 Home, Personal, or University
From any device, go to your Microsoft account, Installs page and sign in using your Microsoft account, if prompted.
Under Devices, locate the device where you want to deactivate Office 365.
Select Sign out of Office to deactivate Office 365 on the device.
Office 365 for business
From any device, go to https://portal.office.com/Account/#home and sign in using your work or school account, if prompted.
From the Install status tile, select Manage installs.
Under Install status, select Deactivate to deactivate the Office installs you no longer use.
After you deactivate Office 365, you still can view and print documents from that device, but you won't be able to edit them or create new ones. If you want to use Office 365 on the device, you'll need to sign in to Office 365 when prompted.
There is no way to deactivate Office Home & Student, Office Home & Business, Office Professional, or individual Office apps. Instead, you must reinstall and activate using the process described in Activate after reinstalling Office.