Learn how to activate Microsoft 365 or a non-subscription version of Office with or without a product key. Find out how to activate Office from a new Windows device, a Microsoft Workplace Discount Program, or a brand new Office product key. Learn where and how to enter your Office or Microsoft 365 product key for different versions of Office, including Office Professional Plus. Find out how to redeem, install, or renew your product, and what to do if you have problems with your key or need a refund. 9sVT7.