As part of today’s quarterly earnings conference call, Microsoft revealed that there are now over one billion Windows 11 users. That’s a big milestone by any measure, but here’s what I find interesting: It took Windows 11 less time to reach one billion users than it did for Windows 10. Microsoft released Windows 11 on October 5, 2021. It announced the one billion milestone for Windows 11 today, on January 28, 2026. So it took Windows 11 four years and three months to reach the one billion number.