110 million PCs have now been upgraded to Windows 10.
Of course there are a few caveats to this number - Microsoft has been quite persuasive in getting Windows 7 and 8 users to upgrade with pop-up messages, while the update is completely free, which always helps.
(By the way, here's how to upgrade to Windows 10 if you haven't already.)
Not everybody is happy - we've encountered PCs upgraded to Windows 10 that are now running slower than ever. But they're not the majority (if your system is running really slow, let us know in the comments below).
Check out our great Windows 10 coverage