It appears that Microsoft can blame their quarterly's on the global financial thing as that is a valid reason, when you take all other financial data points into account. Saying it is all Vista's fault is a straw man argument, given ALL of the data shows otherwise.
If anyone cares to look at the actual financial data, rather than making wild claims, you would notice that Microsoft's Growth alone last year was about half of Google's total revenue. Sure, Google is doing fantastic, but that's not to say Microsoft is completely F-ing it up (like the Author claims when comparing the two).
Secondly, I won't dispute the figures that Apple are outselling Microsoft in the >$1000 market, because I don't have access to all the figures but I personally would expect that would be the case given that is the market Apple targets. I would suggest that if the Author wants to take a realistic view of Microsoft's position in the computer market, he should look at TOTAL machines sold, not just one market segment.
It would be like arguing that Ferrari dominate every other car manufacturer worldwide because they make the most cars that are red that come from Italy...
[Disclaimer: Not a Microsoft Employee or Fanboy, just sick of propaganda]
EDIT - fixed an error with Google/Microsoft revenue/growth comparison