With Windows — perhaps more than any other major tech product — it's difficult to come to definitive conclusions about how it's doing based on raw numbers. A gigantic number of new PCs are going to ship with the current version of Windows no matter what; sales figures don't tell you what people think of Windows 8 once they get it, and convey only so much about whether typical consumers see it as an inducement to buy a new computer, or an argument against doing so.

That said, some numbers are better than no numbers — and in a new Q&A blog post, Tami Reller, the Microsoft executive responsible for the business side of Windows, has disclosed some new ones, while failing to mention one meaningful metric.

Reller says that Microsoft has sold more than 100 million copies of Windows 8 since the operating system shipped on October 26…

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