I am a Windows/Capitalism fan as much as the next guy, but I don't know if it's entirely fair to lump Linux with Apple. Of course, as someone else said, it's hard not to have scrutiny when you're installed on about 97% of the world's personal computers. The most recent Windows flaw, dealing with images, affected every Windows OS since 1990! It took that long to discover.
I agree about lumping Linux with Apple. Maybe someone can explain why they would do that.
What is really funny is that windows 98 is more secure than windows XP. Even the latest wmf problem is not currently a threat to 98 according to microsoft.