There are years between XP, Vista and 7. Between XP and Vista, almost a decade if you really want to exaggerate. It gives plenty of time for the versions and th

There are years between XP, Vista and 7. Between XP and Vista, almost a decade if you really want to exaggerate. It gives plenty of time for the versions and their peculiarities to absorb into people's minds. Android is different. Google makes releases fast and there's hardly an era between them. Most people probably don't know there are Android versions, the rest will assume there's Android 1.x and Android 2.x, and a mere minority will know that the 2.1→2.2 is greater than 2.0→2.1 partly because in 2.2 Dalvik has a JIT compiler.