Key Management Service (KMS): Office is activated by contacting a KMS host computer on your network. There are three different methods that you can activate volume licensed versions of Office, including Project and Visio: Volume activation is the process that Microsoft volume licensing customers use to automate and manage the activation of Windows operating systems, Microsoft Office, and other Microsoft products across large organizations. If you're a user trying to activate a personal copy of Office at home, see Activate Office instead of reading this article.