Public Developer Preview for Microsoft Teams
How to enable Developer Preview To participate in the Public Developer Preview, you need to do the following: Go to your Teams client menu and switch to the preview under Menu → About.
What do you get? The following features are available in the Public Developer Preview as of August 25, 2017.
Apps in Microsoft Teams Apps in Microsoft Teams allow you to make your service available to users through a single Teams App package, which includes bots, tabs, connectors and compose extensions.