Microsoft has discontinued which version of Windows and why?

Microsoft has retired multiple Windows versions over the years for various reasons. Some of the most recent are as follows:

Windows 10, which was supposed to be the final version of the operating system, will be phased out in 2025 when Microsoft releases a new OS.

Windows 10X, a next version of Windows designed for modern computing, was cancelled in 2021 owing to technical difficulties and a lack of demand.

After January 10, 2023, Windows 8.1 will no longer receive security updates or technical support.

Windows 7, which reached the end of its 10-year support cycle on January 14, 2020.

Microsoft typically retires older versions of Windows in order to concentrate on supporting newer technologies and providing better user experiences.