Install a KMS client key
You can use the Volume Activation Management Tool (VAMT) to install Generic Volume License Key (GVLK), or KMS client, product keys. For example, if you're converting a MAK-activated product to KMS activation.
Note
By default, volume license editions of Windows Vista, Windows® 7, Windows 8, Windows 10, Windows Server 2008, Windows Server 2008 R2, Windows Server® 2012, and Microsoft® Office 2010 use KMS for activation. GVLKs are already installed in volume license editions of these products.
To install a KMS client key
Open VAMT.
In the left-side pane, select Products to open the product list view in the center pane.
In the products list view in the center pane, select the products that need to have GVLKs installed. You can use the Filter function to narrow your search for computers by clicking Filter in the right-side pane to open the Filter Products dialog box.
In the Filter Products dialog box, you can filter the list by computer name, product name, product key type, license status, or by any combination of these options.
To filter the list by computer name, enter a name in the Computer Name box.
To filter the list by Product Name, Product Key Type, or License Status, select the list you want to use for the filter and select an option. If necessary, select clear all filters to create a new filter.
Select Filter. VAMT displays the filtered list in the center pane.
Select Install product key in the Selected Items menu in the right-side pane to display the Install Product Key dialog box.
The Install Product Key dialog box displays the keys that are available to be installed.
Select the Automatically select an AD or KMS client key option and then select Install Key.
VAMT displays the Installing product key dialog box while it attempts to install the product key for the selected products. When the process is finished, the status appears in the Action Status column of the dialog box. Select Close to close the dialog box. You can also select the Automatically close when done check box when the dialog box appears.
The same status is shown under the Status of Last Action column in the product list view in the center pane.