KMS (Key Management Service)-this is an activation type for enterprise customers.You must activate Windows copy with the MAK key installed via the Internet or by phone The number of activations is limited and depends on the type of your license agreement (Open, Select, or Enterprise Agreement). MAK (Multiple Activation Keys)-MAK license is like a Retail (box) license, but allows to activate several instances of Windows using a single MAK key.They can use MAK or KMS keys for product activation. Microsoft offers two ways of Windows and MS Office activation for corporate customers under the Volume License program.
