That's the claim by SPoNG who recently talked with the CEO Victor Viegas. Microsoft's settlement with Immersion back in 2003 put MS in a position to actually make money off the deal. SPoNG also asks why Immersion only sued Microsoft and Sony for patent infringement yet steered clear of Nintendo.

To recap, Immersion, backed by Microsoft will have the right to demand royalties from Sony on every single PlayStation product that makes use of DualShock, an astoundingly astute move resulting in a case that Sony simply must win.