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Fair enough, but it's still unlikely that "your parents, your friends, your relatives", basically every XP user you know will not install an AV software but still keep Windows thoroughly updated, and that every exploit ever patched would be fixed _before_ it can damage you. I'm not blaming MS when it's really expected that the users keep care of their software, we just have to _accept_ the fact that to keep an OS running and connected to the net you have to take care of it.
The article even states that in the opinion of the author Linux, were it in a monopolistic state of diffusion and were it available in a single distrivbution/batch would be more or less as vulnerable as Windows. I am not so sure of this fact, but I see the point.
I am a Windows XP user (AV, Firewall, no IE or Outlook) and a Linux user and I am willing to work to keep them up and running. Atm it's really easier and smoother with Linux, but denying that there's a problem is not really the way to go.