Setup Product key :- Ms Office suite offers a wide selection of products but to access a licensed version, you must have Office product key. After you exceed the free trial period, it becomes mandatory to purchase an Office setup product key. Especially if you work on online Microsoft Office, you can only gain access to your account and other benefits if you have a registered account subscription. office.com/setup
In case you do not have an existing account on Office.com/setup, follow simple steps to register. Whether you use Windows OS or Mac, the steps are applicable for both.