By midday, our security team concluded that newer Windows machines were protected against the attack by a patch we had released two months earlier, but older machines running Windows XP were not. This was not a small problem. There were still more than a hundred million computers in the world running Windows XP. For years we had tried to persuade customers to upgrade their machines and install a newer version of Windows. As we pointed out, Windows XP had been released in 2001, six years before the first Apple iPhone and six months before the first iPod. While we could release patches for
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