Microsoft introduced an operating environment named Windows on November 20, 1985,
as a graphical operating system shell for MS-DOS in response to the growing interest
in graphical user interfaces (GUIs). Microsoft Windows came to dominate the world's personal computer market with over 90% market share, overtaking Mac OS,
which had been introduced in 1984. However, since 2012, because of the massive growth of smart-phones, Windows sells less
than Android, which became the most popular operating system in 2014, when counting all of the computing platforms each operating system runs on; in 2014,
the number of Windows devices sold were less than 25% of Android devices sold. However,
comparisons across different markets are not fully relevant; and for personal computers, Windows is still the most popular
operating system.
As of July 2015, the most recent version of Windows for personal computers, tablets and
smart-phones is Windows 10.The most recent versions for server computers and embedded devices
are respectively Windows Server 2012 R2 and Windows Embedded 8. A specialized version of Windows runs on the Xbox One game console.
