Why not? Partly because of security progress that Microsoft already had made in its last operating system, Windows XP. Also because a complex product like Vista is bound to have holes yet to be discovered. And mainly because of the rapidly changing nature of online threats.

Sure, Microsoft appears to have fixed the glitches that used to make it easy for viruses, worms and other problems to wreck PCs. But other avenues for attack are always evolving.

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