I use Skype everyday at work and have been doing so since November 2013. Although we've tried alternatives, e.g. Discord, nothing has come close in terms of ease-of-use and cross-platform-support, and clear separation between own and others' messages. I'm very sad to see it go, and frankly I don't know what we'll do. I find Microsoft Teams heavy and horrible, so my team and I will probably go down the Discord-route...