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Saw this on Slickdeals, not bad, for a preview edition of the book.
It was based on the April version of Windows 10, but some complaints since then, that they moved too far away from touch and back to desktops, has meant the UI has changed a bit since this ebook, but anyway, after reading this I am sure I will know more about Windows 10 than I do now.
Really only useful for IT professionals, as the title says.
Not a full book by any means. It's a teaser.