This isn't _the_ Skype though, it's the old lync with a new design. You _think_ you can just join a conference call with your normal skype app, but instead, you need to use their "web" app.

Using the term web app you might think that you can just point your browser at the URL and join, however, they've opted to make you download something where the actual conference takes place.

Interviews do mostly use the real Skype, not Skype for Business.