Having switched from Windows to the Mac, I have noticed the subtle and not so subtle ways the Microsoft and Apple business models differ. The first thing that struck me was how Microsoft makes every effort to never brake any 3rd party software. Apple on the other hand is very quick to depricate underlying technologies and if you don't update your software it will be broken. More on that another day.
The other day I had to buy a new PC at work, and what struck me was the number of SKU's Microsoft offers. Here is a screen shot of the list, and not all of it fit on the screen. How many SKU's does apple offer? Two. Far more sensible.