Math is Hard: A Surface Story (Updated)

Math is Hard: A Surface Story (Premium)

UPDATE: As expected, readers quickly found issues with the numbers I provided yesterday. Rather than change the story---which would be both a nightmare and an unacceptable re-writing of history---please see the end of this article for a major correction. Thanks for all the feedback. --Paul

While Microsoft refuses to release hard numbers for Surface sales, I'm wondering if there isn't a way to calculate rough unit sales figures for Surface Pro 4 and Surface Book.

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