The KMS key will enable you to activate all Office 2016 client products (Office Professional Plus, Visio, and Project). KMS server allows corporate and enterprise users to easily manage the activation of Windows machine by using KMS key, and protect the volume license keys. M icrosoft Key Management Service (KMS) is a part of Microsoft Volume Activation 2.0 which in itself a part of an anti-piracy feature of Software Protection Platform, first used in Windows Vista.If you find the link is broken, provide feedback and a VMware employee will update the link. Note: The preceding link was correct as of May 29, 2015. In the Event Viewer on the KMS server you see that all the newly provisioned machines are showing the same Client Machine ID (CMID).