Microsoft did something shocking last night. It launched something people might actually lust over, something sleek, something powerful, something innovative. The Surface Book. At an event in New York rammed with press and industry types and live-streamed to the world, Microsoft confidently and defiantly unveiled its grand vision of Windows 10 devices. Some of the products the company unveiled were expected: an updated Surface Pro 4 tablet, the second generation of the company’s Microsoft Band fitness tracker and two new Lumia smartphones. But it was the Surface Book, Microsoft’s first laptop and a big bet for the company, that drew...