When was Windows 7 discontinued?

Microsoft ended mainstream support for Windows 7 on January 13, 2015, but extended support won’t end until January 14, 2020.

What was before Windows 7?

Windows 7 was released by Microsoft on October 22, 2009 as the latest in the 25-year-old line of Windows operating systems and as the successor to Windows Vista (which itself had followed Windows XP). Windows 7 was released in conjunction with Windows Server 2008 R2, Windows 7’s server counterpart.