Office 365 can be installed and used in 5 devices. This video shows how to enable, disable, delete Devices in Office 365.
1.Login Microsoft Azure.
2.Go to Azure Active Directory admin center.
3.Click Users
4. Type the user name on Search bar.
5. In The user profile, click Devices.
6. In Devices page, you have options to enable, disable, delete and mange the device.
Please view this step by step video: