Windows XP
Microsoft stopped supporting Windows XP on April 8, 2014 (except some security updates e.g. in 2019, to address ransomware threats, and to address major malware threats, such as BlueKeep) and Microsoft and authorities warn users against using Windows XP. However, Windows XP remained a popular operating system around the world for a long time. On July 31, 2019, Microsoft Internet Games Services on Windows XP and Windows ME stopped working, and on January 22, 2020 Microsoft Internet Games Services stopped working on Windows 7, for Windows 8 and Windows 8.1 – on April 5, 2021. By August 2019, Microsoft (and others) had ended support for games on Windows XP. As of June 2021, 0.6% of Windows PCs run Windows XP. Windows XP became the most popular operating system from 2001 to 2007, the operating system, individually and pre-installed, selling over 500 million copies.