Microsoft is supporting cross-platform development like never before, introducing tools to port iOS and Android apps to Windows and allow software to run across multiple form factors, from smart phones to virtual reality headsets.

The goal is to get 1 billion copies of Windows 10 on devices within the next three years, CEO Satya Nadella told a crowd of developers at the opening of the company’s Build 2015 conference. This ambitious cross-platform goal could help the company regain its edge in a world that is rapidly moving beyond personal computers.

The 1 billion number would include all those current computers running Windows 7 and Windows 8 that will get a free upgrade to the new OS, expected about the middle of the year. It would also include a range of other devices, including smartphones, tablets and possibly even Microsoft’s holographic headset, dubbed HoloLens.

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