Images: Which copy of XP is the fake?

Cori Hartje, director of Microsoft's Genuine Software Initiative, holds up pirated copies of Windows Vista and Office 2007 that she obtained for less than $10 apiece on the black market during a December trip to Sao Paolo, Brazil. The street vendor even warned that the copies might not work very long, since Microsoft was likely to invalidate the product keys used.

Photo by Ina Fried/CNET News.com