They make money from lots of random stuff that they advertise in Windows. The Edge browser for instance, which pushes Bing. Also, office applications like Wor

They make money from lots of random stuff that they advertise in Windows. The Edge browser for instance, which pushes Bing. Also, office applications like Word, OneNote, and OneDrive. They’ve got an app store as well, which is not much used, though probably does bring them some money. I think they show ads by default in the start menu. Pretty sure it even comes with certain third party applications, like Netflix, which they are no doubt paid for.