Microsoft’s chief operating system executive yesterday put a stake in the ground, saying that in three years, tops, Windows 10 would be running on a billion devices.

“Our goal is that within two to three years of Windows 10’s release there will be one billion devices running Windows 10,” Terry Myerson said during the keynote address opening Microsoft’s Build developer conference.

Later in the keynote, Myerson kept returning to the goal as motivation for developers to create Windows apps, and how they could potentially monetize their work. “With Windows 10, there will be one billion devices ready to run your applications,” Myerson said.

One billion. A big number. To make that goal, Windows 10 would have to appear on 57,000 devices each hour over the next two years, 38,000 over three.

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