If you are deploying Windows Vista/7 Professional, Enterprise or Server 2008(R2) and you have a KMS host configured, you can simply ignore the sections that ask for product keys during Lite-Touch deployments and skip past them without adding aditional propertys. The KMS keys are stored in the products themselves and the clients will attempt to activate automatically after installation.
If you are using Windows XP, Server 2003 or retail editions of Windows Vista/7 then you will have to provide a product Key at some point during your deployments.
Firstly to skip the pesky product key prompt add this line to your customsettings.ini:
Next, to add a product key to your deployment use this example in either the customsettings.ini or as a task sequence variable:
This will cause MDT to enter the product key in the unattend.xml (for Vista, 7 or 2008) or unattend.txt (for 2003 server, XP) during the deployment.
If you intend to automate your MAK activated deployments you can use this property in either the customsettings.ini or as a task sequence variable: