I found this on another site, figured it would be of interest to many:

"If you purchased a new computer recently and decided to replace the bundled WindowsXP operating system with another OS, such as Linux, you may be able to get a refund on Windows. This site shows an example. I guess it makes sense, since almost every new computer these days comes with Windows regardless of the buyer's desired operating system. Although it looks like a tremendous amount of effort, you may be able to get a $200 refund on your recent computer purchase. Remember, Microsoft is losing a lot of antitrust battles, so if you don't like the operating system that your computer came with, you can get a refund, it just depends on how much effort is worth $200."