To meet its goal of putting Windows 10 on a billion devices within three years, Microsoft will have to turn every personal computer now running Windows 7 onto the new OS, then find even more to migrate, calculations from recent statistics show.

Microsoft staked out the ambitious plan last week at its Build developers conference. “Our goal is that within two to three years of Windows 10’s release there will be one billion devices running Windows 10,” said Terry Myerson, the chief of the firm’s operating system group.

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