I kind of wonder about this. The US Government pours money on Microsoft. The number of Windows servers in government reels the mind, and of course every desktop is Windows, with Office. They previously acquired LinkedIn, which is where a huge number of US citizens, and particularly military folks, park their resumes and roledexes. The LinkedIn social graph essentially subtracts children and stay-at-home spouses, making it somewhat denser with the type of information a foreign government might be interested in. Similarly, GitHub is of huge US national, probably Western strategic interest.

I wouldn't be terribly surprised if some folks at Microsoft were "encouraged" to pursue those deals to keep them out of other hands.