Microsoft Chairman Bill Gates has issued his 2014 annual letter from the Bill and Melinda Gates Foundation, predicting that by 2035 there will be almost no "poor" countries in the world.
A week of Windows 10, holograms and Exploding Kittens on Mars
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Microsoft reveals the next version of Windows 10
Introducing Windows 10 for phones
Hands on with HoloLens
Download: Windows 10 build 9926