Microsoft Windows Server 2012 OEM - CAL (1 User) Platform: Microsoft Windows Server This is one user Client Access License (CAL) for 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 a single user to access Windows Server 2008 R2, 2012 or 2012 R2 Good for companies that have more devices than users (most companies)