Microsoft was founded in 1975 by Bill Gates and Paul Allen. It has developed many versions of the Windows operating system over the years from Windows 1.0 in 1985 to the current Windows 10. Some key versions include Windows 95 which had built-in Internet support and helped popularize personal computers, Windows XP which sold over 400 million copies and had a redesigned interface, and Windows 7 which was the fastest selling operating system ever and improved streaming media capabilities. Microsoft continues to be a dominant force in the technology industry through its software products.