I may be mad, but I have suspected for some time now that all this may have a 'bill' attached somewhere in the background. Ask oneself - *who* exactly is it that really sees Linux as a threat...? And if this seems unlikely, don't forget - MS actually still gets licence fees on every actual UNIX copy sold (hard to believe? Think Xenix...)
See
http://www.eweek.com/article2/0,3959,1094805,00.asp