Kicking off the consumer-focused Windows 10 event in Redmond on Tuesday, Microsoft operating system chief Terry Myerson announced that current users of Windows 7, Windows 8.1, and Windows Phone 8.1 will be able to upgrade to Windows 10 for free for one year after the operating system launches. Once you've claimed the upgrade, Microsoft will keep you updated for the supported lifetime of the device.
"We think of Windows 10 as a service," Myerson said.
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Brad Chacos