...and Microsoft tried, was spurned, and built Teams and is pushing Teams and Skype to attack Slack where it lives.

They need to get Teams right before they are attacking anything except the coffee maker. I hope they do get it right cos we use s4b at work. I really want them to make that a capable product so that i dont have to use a basket of products to get communications done: yammer, s4b, email, FTP, sharepoint, internal systems (that really just need a bot to chat with instead of a app UI),....and many others.

Last year Microsoft also released Planner, a Trello clone.