Microsoft's technical fellow Alex Kipman reveals "HoloLens 2" during a presentation at the Mobile World Congress.

Microsoft's technical fellow Alex Kipman reveals "HoloLens 2" during a presentation at the Mobile World Congress.

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Microsoft CEO defends US military contract that some employees say crosses a line

Satya Nadella has defended Microsoft's $479 million contract to supply augmented reality systems to the US military that has been criticized by some of his colleagues.