An anonymous submitter writes "The Register is reporting in this article striking new evidence of what in my opinion can only be described as abuse of their monopoly position. A recent SEC filing shows that they lose money in every business area except Windows (86% profit) and Office (79% profit)."
Another notes that the Financial Times has a story on the same subject - Dr. No writes "According to the Financial Times, Microsoft's Windows division has a profit margin of 85%. This is the first time this figure has been made public."
The full version of Windows XP costs about $300.00. Microsoft could sell it for $45 and still make a profit. The difference between the $45 price and the $300 price is what economists call "monopoly rents