Our small company when with a hosted[1] Matrix Synapse server with federation turned off. Have been quite happy with it. We use the Element client, which is ye

Our small company when with a hosted[1] Matrix Synapse server with federation turned off. Have been quite happy with it. We use the Element client, which is yet another Electron application, but there are several other clients out there, so you would have some options to explore. [1] https://element.io/matrix-services https://element.io/matrix-services