Mister Softee wants to be relevant again. Under new CEO Satya Nadella, the tech giant has unveiled HoloLens, a virtual-reality headset that superimposes 3D renderings onto the real world. It’s the company’s most ambitious project in years and the shiny centerpiece of its new Windows 10 operating system, due out this autumn with a bevy of other tools. These include a Siri-like virtual assistant, on-screen note-taking and Xbox One streaming. Look out Oculus, Microsoft has the virtual reality market in its sights.