

To be honest offline Office 2016 is a solid product and the desktop software is still more snappy and capable than the online counterparts. If you don’t need collaboration and online integration there’s little reason to go subscription based. I can understand that small companies make that decision. After all it is just a tool and not a goal in itself.

The only choice so far is Birdychat, which is business related. I’m afraid Signal would be hard to integrate due to its encrypted nature (and the fact that it’s not European). I hope Threema will follow.