Maybe 8 or 9 years ago, I talked to the Dean of the University of Colorado Comp Sci department. I could only remember Benjamin Zorn as a faculty member, so I dropped the name. By then, Zorn had gotten hired away to Microsoft R&D. The Dean of the Comp Sci department made a number of references to Microsoft R&D as a "research roach hotel" - researcher's go in, but no papers ever come out.
If Microsoft R&D is a secret, then it's Microsoft's own problem, I assume.