As a result, Windows 11 has just cleared a big milestone—Microsoft CEO Satya Nadella said on the company’s most recent earnings call (via The Verge) that Windows 11 now has over 1 billion users worldwide. Windows 11 also reached that milestone just a few months quicker than Windows 10 did—1,576 days after its initial public launch on October 5, 2021. Windows 11 was (and still is) a free upgrade to Windows 10, but its relatively high system requirements mean there are plenty of Windows 10 PCs that aren’t eligible to run Windows 11. Windows 10’s long goodbyeIt’s hard to gauge how many PCs are still running Windows 10 because public data on the matter is unreliable. If Windows 11 just cleared the 1 billion user mark, that suggests Statcounter’s reporting of a nearly evenly split user base isn’t too far from the truth.