What is the Key Management Service (KMS)?
The Key Management Service (KMS) is an activation service that allows organizations to activate systems within their own network, eliminating the need for individual computers to connect to Microsoft for product activation. It does not require a dedicated system and can be easily co-hosted on a system that provides other services.
KMS requires a minimum number of either physical or virtual computers in a network environment. These minimums, called activation thresholds, are set so that they are easily met by Enterprise customers.
- Activation Thresholds for Windows – Your organization must have at least five (5) computers to activate servers running Windows Server 2008 or Windows Server 2008 R2 and at least twenty-five (25) computers to activate client systems running Windows Vista or Windows 7.
- Activation Thresholds for Office – Your organization must have at least five (5) computers running Office 2010, Project 2010, or Visio 2010 to activate installed Office products using KMS. For more information about Volume Activation of Office products (that is, Office 2010, Project 2010, and Visio 2010), see the Volume Activation Quick Start Guide for Office 2010, and Volume Activation Overview for Office 2010.