[yakk0]

Teams does something much better than SfB. It keeps IMs in sync between clients and devices. If I reply to an IM on my phone in SfB it stays on my phone. There's no way to get that conversation history onto my desktop client. Teams acts like you would expect and all clients get all the history.

[StringyBob]

Yes SfB's biggest problem is that it has skype in the name so people try to use it as an instant messenger.

It's ok for audio/video, but an abomination for instant messages - almost spitefully bad for text based communication due to the way it randomly redirects messages within a conversation to e.g. Outlook.