You said:

In the long years since XP was launched, Apple have come out with five major upgrades to OS X, upgrades which (dare I say it?) install with about as much effort as it takes to brush your teeth in the morning. No nightmare calls to tech-support, no sudden hardware incompatibilities, no hassle. Why hasn’t Microsoft kept up? Unmaintainable.

And why do you think that is? Apple have half a dozen systems to make their software compatible with. Microsoft have the other billion.

Stick to the facts please.