The thing is, their threaded interface kinda sucked, so they built another one ('chat') and tried to push the idea that 'Teams' (threaded) is for 'permanent' info, and 'Chat' is for the ethereal one. Except nobody really bothers with switching back and forth, most teams just choose one or the other and do everything in there. Bit of a mess.

I cannot fault them on the meeting functionality and sharepoint integrations though, they are excellent.