“Never heard of Teams.”
Our plant uses Teams for meetings and whatnot. Any of these work pretty well when you get familiar. Like a lot of these communicating apps it’s the one that’s most widely used that you want to operate with.
Remember ICQ? It was cool when it came out but only if everyone else was using it. Later Yahoo messenger. Now Facebook would serve kind of but again only if your friends are active on it.
ICQ, lol, forgot about that one.. (little flower icon)
mIRC is still being used today, as far as I know..