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Nowadays most of apps require windows 7.5 and that's why I want to update windows 7.5 in windows 6.1 professional.

marked as duplicate by Thomas, Mikael Dúi Bolinder, Rowland Shaw May 11 '15 at 11:24

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It is not possible to update a Windows Mobile 6 device to Windows Phone 7 OS as this is a completely different system with different hardware requirements.

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