I can't believe it
I cannot, for the life of me, imagine for one second that anybody is taken Microsofts claims seriously. No really, after SCO and years of legal hide-and-seek that finally exposed three lines of comment as sole grudge, can anyone actually believe that Microsoft has a leg to stand on ? Not to mention that we're talking about a company that has used absolutely every underhanded tactic in the book, and probably some that are not in the book, to "acquire" the code it wanted, whether or not it had a license for it.
No. The SCO business has amply demonstrated that the FOSS community is not liable to anyone. Microsoft is not going to change this.
Besides, this is the company that has patented the use of the "msgbox" moniker. Nobody else is supposed to use that in any programming language. Congratulations, Microsoft ! That really helps advance programming !