Microsoft also had MindAlign, which was an excellent no-nonsense group chat originally spun off from UBS (!) and widely liked by its users at various big firms, mostly banks- basically it was like IRC with management tools and record keeping added to meet compliance and audit needs. Bits got folded into Lync/ Skype for Business but those were never as good and certain customers are still using the original product.
Goldmans’ response to Bloomberg reporters looking at stuff they shouldn’t have… Symphony is pretty good. It does have video calling but I think many customers opt not to use it.
