About a quarter of PCs are still running Microsoft’s previous operating system. Microsoft ended official support for Windows 10 in 2025, but the company may have a harder time than expected putting the operating system out to pasture. After promising a year of optional extended update support, Microsoft has changed its policy, tacking on another year to its Extended Security Updates (ESU) program. If you are still clinging to Windows 10, you don’t have to do anything but enjoy that extra year.