A common complaint comes from those who want to purchase a computer that usually comes preinstalled with Windows "without" a copy of Windows pre-installed and without paying extra for the license either so that another operating system can be used or because a license was already acquired elsewhere, such as through the MSDN Academic Alliance program. Microsoft encourages original equipment manufacturers (OEMs) to supply computers with Windows pre-installed by presenting their dominance in computer sales and arguing that consumers benefit by not having to install an operating system. Because the price of the license varies depending on discounts given to the OEM and because there is no similar computer that the OEM offers without Windows, there is no immediate way to find the size of the refund. In 2009, Microsoft stated that it has always charged OEMs about $50 for a Windows license on a $1,000 computer.