Killed by Microsoft
Contrary to Google, Microsoft often provide a migration path to another of their service covering the same usecases.Examples:Skype For Business => Teams.Microsoft Edge => Chromium Edge.Windows 10 IoT Core => It's not dead ???Office Viewer => Web Based OfficeKinect => It's not dead ???Microsoft Anti-Virus for Windows => Windows DefenderCome on, microsoft has big flaws but backward compat/keeping old product alive is where they are one of the best in the industry.