These instructions are for any Office 365 user who wants to deactivate Office on a specific device. You can have Office on up to five devices, so if you've reached that limit and want to add Office to a sixth device, you'll need to remove it from an older device. You might even see a "Limit Reached" error indicating you can't activate on any new devices.
Follow the instructions on the Microsoft support site to deactivate Office 365 for business.