Microsoft sues Google over defection; does it have a case?

As a layman, I expect this to be the crux of the Google defense and the Microsoft complaint.

My guess would be that Google will claim that the projects on which the good doctor would be employed would be of a different nature than those on which he worked at Microsoft and Microsoft will claim that he is bringing knowledge of “actual or demonstrably anticipated research or development.” Given the hinky nature of computer development and the equally hinky nature of tort history, I would make no guess regarding the outcome at this time.