Microsoft Windows release dates history:
In 1998 was released Windows 98
In February 17, 2000 was released Windows 2000
In 25 October 2001 was released Windows XP
In April 24, 2003 was released Windows Server 2003
In November 30, 2006 was released Windows Vista
In October 22, 2009 was released Windows 7
In October 26, 2012 was released Windows 8
In October 17, 2013 was released Windows 8.1
In July 29, 2015 release Windows 10
Windows 11 release date ???
Because Microsoft has committed to treating Windows 10 as a service, there is no current release date or download for a Windows 11. Instead, Microsoft will continue updating Windows 10 with new features and security patches. The next major Windows update, expected in October 2021.