We were somewhat surprised to see Microsoft recently admit that in the wake of the revelation that the NSA had infiltrated the private data links between Yahoo and Google's data centers that it had not yet decided to encrypt its own such links. Google had very quickly moved to encrypt those links and Yahoo has recently done so as well (though it took a little while). Now Microsoft is saying that it's going to do the same thing.
While the revealed documents did not directly point to a similar infiltration of Microsoft, there's reason to believe it was also compromised. Other Snowden documents mentioned in the linked article above note that Microsoft is listed as having data accessible under the same program, referred to as MUSCULAR. Perhaps more interesting is Microsoft making it clear that it believes any such infiltration would be a serious legal violation:
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