They attached the Skype brand to an unrelated product (Lync -> Skype for Business) From what I remember, the two Skypes were never fully interoperable. I gues

They attached the Skype brand to an unrelated product (Lync -> Skype for Business) From what I remember, the two Skypes were never fully interoperable. I guess they wanted to start fresh rather than clean up that mess and didn't want a third incompatible Skype.