if you start a private chat with a user, and they have never logged into Teams, it sends them a Skype for Business message. So I can be using Teams and they ca

if you start a private chat with a user, and they have never logged into Teams, it sends them a Skype for Business message. So I can be using Teams and they can still be using S4B the team chats are threaded with embedded documents, likes, emojis etc