Well this is a funny story about Microsoft posted on The Register (thanks Fragzone). Seems like MS ***** again.. Here is a clip:

If a PC shipped with Windows preinstalled, can you remove the OS and install Linux instead? Well, no, according to Microsoft. A somewhat obscure Microsoft site aimed at helping schools deal with donated computers flatly states: "It is a legal requirement that pre-installed operating systems remain with a machine for the life of the machine." Read full article here!