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Microsoft Windows

Month after debut, Windows 10 running on 75 million devices

SEATTLE Microsoft, a company built on getting people to pay for software, is reaping the benefits of free. Four weeks after its debut, the new Windows 10 operating system now powers more than 75 million devices, Yusuf Mehdi, the Microsoft executive overseeing Windows marketing, said Wednesday. Much of that momentum, analysts say, is because Microsoft is offering Windows 10 free to the majority of home users of the prior two major Windows releases. Microsoft has said the offer will extend at least through next July. "That's pretty impressive," said Steve Kleynhans, an analyst with researcher Gartner. "I don't think any other operating system achieved that in less...