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Their three-year Windows Vista nightmare is over. That operating system’s wretched reputation may have been overblown; at the outset, it was slow, intrusive and incompatible with a lot of gadgets, but it’s been quietly improved over the years. Nonetheless, the corporate software buyers who order copies of Windows by the gross weren’t impressed. As recently as this summer, at least two-thirds of corporate computers were still running the positively ancient Windows XP.