You forget that they replaced Skype with an MSN service while doing this. So in reality you might as well say they "reskinned" Office messenger, called Lync (w

You forget that they replaced Skype with an MSN service while doing this. So in reality you might as well say they "reskinned" Office messenger, called Lync (which I believe started as a version of MSN messenger long ago) and then put out an "update" for Skype that replaced it with Lync, with the banners, window titles, website names, etc, replaced with "skype". That's what happened.