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>Microsoft says four copies have even been sold to people in Antarctica

Does anybody know who these people might be?

I'd wager it's scientists and/or laborers at McMurdo.

Also, how do they know the sales are in Antartica?

Billing address?

96598 is the zip code of the south pole.

Presumably based on netblocks and email addresses, I doubt anyone's billing info is going to match their location though.