Microsoft Windows Server 2012 OEM - Client Access License (5 Users) This is a 5 user Client Access License (CAL) Pack for use with Windows Server. This is not a Windows Server License. You will need to purchase or own a Server License for use with this CAL Every user or device accessing Windows Server requires a CAL This licensing pack allows 5 named users to access Windows Server 2008 R2, 2012 or 2012 R2 Good for companies that have more devices than users (most companies)