According to this post on the Register, Microsoft‘s CEO Steve Ballmer claims the Linux community is using Microsoft source code, without being aware of it.  Strange, I though the MS products were closed source. How come Microsoft source code could be included in Linux ? Did they leak some on purpose ?
It looks like a remake of the SCO vs Linux story.  It seems that if a company can no more compete on the basis of innovation, it will use legal threats instead.
Microsoft has already settled a deal with Novell regarding Suse Linux, by which Novell paid $40 million to Redmond. This was previously presented as a mutual technology transfer. It now looks much more as a settlement to avoid future legal threats.