...as long as that hardware is Intel-based (and a select few ARM-based boards nowaways). And the reason that it runs on all that hardware is because of Microsoft's business contracts with hardware vendors, not because of their software quality -- that's immaterial, as Microsoft generally does not write the drivers.
A lot of it is the fact that the OS has created a very complex yet consistent system of device compatibility that was completely absent from all competitors who are still behind on that aspect or alternatively the choice of kernel design architecture
edit:
I just remembered when I first used CUPS to configure a printer in 2003. It blew my mind with how easy it was, and I think that was the moment when I decided to start using linux as my primary desktop. Pre-Novell Suse at the time if im remembering correctly.