> My company already has Slack, HipChat and Teams, and it's a communications nightmare. People are constantly confused and asking for which chat client one manager uses, while others don't know where to go for the support channels.

I'm curious about how many people in the company are affected by these problems. Most developers and infrastructure people use the same communication tools, but perhaps support and sales may use their own tools. Given that, how often do developers and infrastructure need to communicate in real time with sales or support?

I would suspect that it's not often enough that email wouldn't work as a way to handle issues or open support tickets. Now managers have to deal with communications between their own team and other teams and parts of the org, but, in my opinion, having to deal with different chat platforms is part of their job and they should be the ones to deal with it rather than forcinng everyone to use the same platform, even if it's suboptimal for certain users.