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Upgrading to Windows Pro x64 from Windows 7 Ultimate x86 - Microsoft Community - More Information

  You can still qualify for a free upgrade to Windows 10 if you own a valid Windows 8. The exact same hardware was used for each configuration with the only difference being the OS used. Developers are receiving an even bigger incentive from Microsoft's "One Windows" strategy, by which developers can write one universal app for Windows and have it run on Windows Phone, Xbox and Windows 8. The day when Windows 8.