There are literally millions of computers happily running Windows XP, Windows Vista, Windows 7, old versions of OS X, Android 2.x, and 2+ year old releases of L

There are literally millions of computers happily running Windows XP, Windows Vista, Windows 7, old versions of OS X, Android 2.x, and 2+ year old releases of Linux. For what a lot of people do on computers, old software still works just fine. Yes, you don't get all the latest updates, but millions of people don't care at all. Certainly millions don't care enough to spend money to upgrade. More than that, a lot of people don't really notice the difference.