Everything that's running Windows 10 at my house is upgraded. The ultrabook started out as Windows 8 Home, Surface Pro 3 as Windows 8.1 Pro.
Two desktops have also been upgraded in my house. The primary (a Core i5) started as Windows 7 Home Premium, received a free upgrade to Windows 8 Home, a paid upgrade to Windows 8 Pro (for Media Center), an upgrade to 8.1, and then Windows 10 Pro. The other computer (an original-release Core 2 Duo), came with a Windows Vista Ultimate license, which was immediately converted to Windows 7 Home Premium, and lived that way until an upgrade to Windows 10 Home. It's a household music server (using Asset UPnP) and occasional TV recorder.