
Converting a retail license of Windows to a KMS client.Converting a computer from using a Multiple Activation Key (MAK).There are some scenarios, however, where you'll need to add the GVLK to the computer you wish to activate against a KMS host, such as:

Computers that are running volume licensing editions of Windows Server and Windows client are, by default, KMS clients with no extra configuration needed as the relevant GVLK is already there. This key is sometimes referred to as the KMS client key, but it's formally known as a Microsoft Generic Volume License Key (GVLK). Computers that activate with a KMS host need to have a specific product key. To use KMS, you need to have a KMS host available on your local network.

Key Management Services (KMS) client activation and product keys
