Comment by kwanbix

You can choose to also use slack, or the OP app, if you think the beneffit you get by using the app is greater than the value of paying for it. Nobody is preventing you. Since MS included it for free, is not like you can not pay for the other app because you used the money to pay for teams. I personally don't see the value on slack, but like I said before, I have worked at companies where we had both, office/slack or gw/slack.