https://arstechnica.com/information-technology/2020/01/windows-7-im-not-dead-yet/

We are here to bury Windows 7, not to praise it. Today is the day that Microsoft's extended support for the Windows 7 operating system ends. Microsoft stopped selling Windows 7, which was first released in 2009, on October 13, 2013. Sales of systems with Windows 7 pre-installed ended three years to the day later in 2016. It lived a long life and is survived by Windows 10 and maybe a few remaining instances of Windows 8.

But it seems most organizations are in no hurry to cast off the now-unsupported Microsoft operating system, based on a survey from the enterprise content delivery company Kollective. A survey of 100 US- and UK-based companies found that overall, 53 percent of companies had not completed or had not started migration off of Windows 7 to Windows 10.