&gt; professional security people would have told you the same thing back in 2007<p>Did they really turn it around that fast, in one iteration of Windows (XP was released 2001, Vista in 2007)? I would think that fixing bugs would be necessary but not nearly sufficient, and they would have had to re-architect and re-develop major parts of the system. And Microsoft needed to do that while maintaing the backward compatibility that is a major selling point and pushing products out the door quickly enough to generate revenue.<p>It sounds like a nightmare, and not acheivable in 4 years. My impression was that many bugs were fixed but there wasn&#x27;t a major redesign, which always made me doubt how secure Windows could be.