Windows 10 launched on July 29, 2015. Microsoft had skipped Windows 9 entirely, partly to mark a clean break from Windows 8, which had not been received well, and partly to signal that the new release was a more significant departure than a normal version increment would have implied. The rollout was free for most existing Windows users for the first year, an approach that was unusual for Microsoft and that produced an unusually fast adoption curve in the months following launch.
The product itself addressed many of the criticisms that had attached to Windows 8. The Start menu was back. The dual interface that had tried to serve both desktop and tablet users with the same UI had been substantially separated. Cortana was integrated as a system-level voice assistant. The new Edge browser was meant to be a fresh start beyond the legacy of Internet Explorer.
The strategic shift the release represented was more interesting than any single feature. Microsoft was committing to Windows as a service rather than as a discrete product released every few years. Updates would arrive continuously rather than as major version events. The traditional Windows release cycle, where a version of the OS shipped every three or four years and would be supported for ten years, was being replaced with a model closer to how web services and mobile platforms updated.
This shift had implications that took years to fully play out. The continuous update model produced ongoing improvements without requiring users to buy new versions, but it also produced telemetry expectations and update behaviours that some users found intrusive. The early years of Windows 10 included controversies about how aggressively the OS pushed updates, what data it collected, and how much control users had over their own machines.
Beyond the product, the release reflected a broader change in Microsoft strategy under Satya Nadella, who had taken over as CEO eighteen months earlier. The company was repositioning around cloud services, with Windows treated as one entry point into a Microsoft ecosystem rather than the central asset whose dominance defined everything else. The free upgrade strategy was consistent with that repositioning, treating Windows distribution as an investment in the user base rather than a revenue source in itself.
Windows 10 itself would remain the active version for almost a decade, far longer than any previous Windows version. The release that promised continuous updates ended up not needing to be replaced for far longer than the version-based releases it had replaced.