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To the extent that Microsoft's vision for Windows 10 is one operating system that runs on devices in all sorts of shapes and sizes, there's been a big piece missing in that vision so far, and that's phones, we've known Windows 10 was coming for phones, but we haven't seen all the details of what a smartphone designed for Windows 10 really looks like. Mobile is easily the largest and most important category of computing devices today, and Microsoft hasn't had a compelling story in this space for years now. This week is their chance to show they can still be relevant in mobile.