Key Management Service (KMS) allows organizations to activate systems within their own network.Either or both key types may be used by customers to activate systems in their organization: Volume Activation provides two different models for completing volume activations. It is not tied to license invoicing or billing. Volume Activation applies only to systems that are covered under a Volume Licensing program and is used strictly as a tool for activation. Tools to manage volume activation of Office.Volume activation is also used with other software from Microsoft (most notably the Office suites) that are sold under volume licensing agreements and that support volume activation

Volume activation is a configurable solution that helps automate and manage the product activation process on computers running Windows operating systems that have been licensed under a volume licensing program.