Considering there was an article just a few days ago in NYTimes [1] claiming that "Skype is so secure because of its decentralization" that law enforcement tries to pass laws against it, I'd say a lot of people aren't aware that Microsoft does have access to all the information at this point thanks to their "super-nodes", but even NYTimes writers aren't aware of it (or maybe it was just a cloaked advertorial for Skype).

I'll also continue to say how extremely disappointed I am that none of the major IM players (not Google, not Apple, not Microsoft, not Yahoo, not Facebook) wants to implement OTR encryption in their chat apps. Google even removed their fake "OTR" from the new Hangouts app, which I believe only hid your logs from yourself, not from Google themselves.

[1] - http://www.nytimes.com/2013/05/17/business/concerns-arise-on...