The Volume Activation Management Tool (VAMT) can be used to perform volume activation using the Key Management Service (KMS). You can use the VAMT to activate KMS client keys on products accessible to the VAMT. The KMS client keys are the default product keys used by the volume-license editions of Windows Vista®, Windows 7, Windows Server® 2008 and Windows Server 2008 R2, and Microsoft Office 2010. KMS client keys are already installed in volume-license editions of these products.


Before configuring KMS activation, ensure that your network and the VAMT installation meet the following requirements:

  • KMS host is setup and enabled.

  • KMS clients can access the KMS host.

  • The VAMT is installed on a central computer with network access to all client computers.

  • The products to be activated have been added to the VAMT.

  • The VAMT has administrative permissions on all computers to be activated, and Windows Management Instrumentation (WMI) is accessible through the Windows Firewall. For more information, see Configure Client Computers.

To configure computers for KMS activation

  1. Open the VAMT Microsoft Management Console snap-in.

  2. Select the products to be activated by selecting individual products in the product list view in the center pane.

  3. Right-click the selected products to display the context-sensitive Actions menu, or choose from the Action menu on the top menu bar, or choose from the Selected Items menu from the right-hand pane.

  4. On the menu, click Activate and then click KMS Activation to display the Configure KMS host and port dialog box.

  5. Select one of the two activation options:

    • Auto-Discover KMS host using DNS. The VAMT will first clear any previously configured KMS host on the target computer and instruct the computer to query the Domain Name Service (DNS) to locate a KMS host and attempt activation. If the client contains a registry key with a valid KMS host, that value will be used instead.

    • Use specific KMS host and port. For environments which do not use DNS for KMS host identification, the VAMT will set the specified KMS host name and KMS host port on the target computer, and then instruct the computer to attempt activation with the specific KMS host.

  6. If you are activating products that require administrator credentials different from the ones you are currently using, select the Use Alternate Credentials check box.

  7. Click OK.

  8. The VAMT will display the Activating products dialog box until it completes the requested action. If you selected the Alternate Credentials option, you will be prompted to enter the credentials.