The best workplace communication tool I used was effectively just a Usenet newsreader. Ie, topic-based threaded shared email. With a good client that shows eg t

The best workplace communication tool I used was effectively just a Usenet newsreader. Ie, topic-based threaded shared email. With a good client that shows eg the number of new messages on a thread, or only unreads etc, ie standard email stuff, nothing else comes close IMO to that for efficiency and clarity. I'd add in IM for quick 1-to-1 chats but that's all.