I remember using it a couple of decades ago for work calls. Back then I was primarily using it for audio, but eventually the video quality improved. I think there was a time when they were trying to charge for international calls using Skype to traditional phone numbers.
https://www.ign.com/articles/end-of...place-it-with-free-version-of-microsoft-teams
https://www.ign.com/articles/end-of...place-it-with-free-version-of-microsoft-teams