There was always clouds of doubts around Microsoft’s claims that Android and Linux infringes upon their patents. While Microsoft continued to threaten companies into signing deals with them or face legal actions, it never disclosed what patents were at stake. The victims were forced to sign an NDA so that the world never gets to know which patents Microsoft is talking about — the chances are these are non-existent claims and Microsoft doesn’t want this bluff to be caught.
Barnes & Noble caught this FUD and counter sued Microsoft. Microsoft was sweating in its pants as the case headed towards the trial and Microsoft started to withdraw their bogus patents from the case. Just before the battle reach the trial Microsoft, typical to its character, paid B&N heavily, settled outside the court, and the world never got to see the bogus patents.
Microsoft is again at the verge of being exposed.