OLPC's dedication to "Free and open source" was questioned with their May 15, 2008, announcement that large-scale purchasers would be offered the choice to add an extra cost, special version of the proprietary Windows XP OS developed by Microsoft alongside the regular, free and open Linux-based operating system with the SugarLabs "Sugar OS" GUI. Microsoft developed a modified version of Windows XP and announced in May 2008 that Windows XP would be available for an additional cost of 10 dollars per laptop. James Utzschneider, from Microsoft, said that initially only one operating system could be chosen. OLPC, however, said that future OLPC work would enable XO-1 laptops to dual boot either the free and open Linux/Sugar OS or the proprietary Microsoft Windows XP. Negroponte further said that "OLPC will sell Linux-only and dual-boot, and will not sell Windows-only laptops". OLPC released the first test firmware enabling XO-1 dual-boot on July 3, 2008. This option did not prove popular. As of 2011, a few pilots had received a few thousand total dual-boot machines, and the new ARM-based machines do not support Windows XP. No significant deployment purchased Windows licenses. Negroponte stated that the dispute had "become a distraction" for the project, and that its end goal was enabling children to learn, while constructionism and the open source ethos was more of a means to that end. Charles Kane concurred, stating that anything which detracted from the ultimate goal of widespread distribution and use was counterproductive.