One of the world's largest software makers, Microsoft was founded in 1975. It is renown for Windows, the world's most popular operating system for PCs and laptops. It launched its Windows Phone smartphone OS in 2010, and its own Surface lineup of tablets in 2012. The Redmond, California based company completed its acquisition of the Nokia Devices and Services division in 2014 Microsoft Lumia is a former line of mobile devices that was originally designed and marketed by Nokia and later by Microsoft Mobile. Introduced in November 2011, the line was the result of a long-term partnership between Nokia and Microsoft. Lumia smartphones run on Microsoft software, the Windows Phone operating system; and later the newer Windows 10 Mobile.