Microsoft has phased out Windows 10, with a deadline of October 14 now passed, leaving approximately 550 million users navigating the transition to Windows 11 amidst rising cyber threats. Windows 10 usage has declined from 880 million in January. Microsoft offers an Extended Security Update (ESU) option for users needing more time to migrate, which provides security updates until October 13, 2026, for enrolled users. Business users have a three-year extended support period, while consumers have a 12-month grace period post-October if enrolled in ESU. The November update addressing zero-day threats is only available to ESU enrollees. There are no contingency plans for users who remain on Windows 10, and uncertainty exists regarding how many users have enrolled in ESU or have eligible devices for Windows 11 upgrades. Users must act before next October to purchase new PCs if needed.