Almost everything that can be said has been said about the latest moves by Microsoft to create Fear, Uncertainty and Doubt (FUD) about Linux. Countless pundits and analysts have pointed out that Microsoft threats are toothless.
Some have noted that Microsoft has singled out Linux and OpenOffice, the biggest threats to its monopoly on operating systems and office suites. Surely Microsoft could claim that the *BSDs infringe on similar patents if not the same ones. But the *BSDs do not pose as great a threat to the company. Others have pointed out that Microsoft would be insane to pull an SCO and sue its own customers. Still others have noted that IBM and/or OIN could respond to a patent war with a massive retaliation in patent infringement claims.
I have no doubt that Microsoft has lifted a lot of GPL code (more likely algorithms) for Windows, which would prevent Microsoft from following through with its threats. To do so would require that Microsoft open its own code to scrutiny. The list goes on, and others have covered the angles very well. There is one perspective I haven't yet seen, at least not the way I propose to deal with it. This perspective follows below.