@W3bbo: No they haven't been tested in court, and no they wouldn't be unenforcable. Your licence says how you can use the software that Microsoft wrote on your machine, and they say you can use it only to run as the operating system of your machine. You can't disassemble it, print it out, covert it to a picture and put it on your wall or run it through another program whose sole purpose is to emulate it on virtualized hardware without Microsoft's explicit say-so.