Tread carefully.
To get a free upgrade to 10, you need either 7 w/ SP1 (service pack 1) or 8.1.
Don't be tempted by offers for "System Builder" editions for distribution with "refurbished PC." Looks like a deal, but it won't upgrade to 10 for free.
Since the price of a valid install disk w/ key for 7 is about the same price... Just buy 10.
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