Windows 11 is an upcoming major version of the Windows NT operating system developed by Microsoft. Announced on June 24, 2021, with an expected release in late 2021, Windows 11 is the successor to Windows 10, released in 2015  

  Windows 10 is a major release of the Windows NT operating system developed by Microsoft. It is the successor to Windows 8.1, which was released nearly two years earlier, and itself was released to manufacturing on July 15, 2015, and broadly released for the general public on July 29, 2015  

  Windows 7 is a major release of the Windows NT operating system developed by Microsoft. It was released to manufacturing on July 22, 2009, and became generally available on October 22, 2009. It is the successor to Windows Vista, released nearly three years earlier  

  Windows 8.1 is a major release of the Windows NT operating system developed by Microsoft. It was released to manufacturing on August 27, 2013, and broadly released for retail sale on October 17, 2013, about a year after the retail release of its predecessor  

  Windows XP, also stylized as Windows xp, is a major release of the Windows NT operating system developed by Microsoft