If you work at a desk, the chances are you spend an increasing amount of your time in Microsoft Teams. If you’re a developer and you want to build solutions that people will actually use, you need to take your solutions to where the users are, and not the other way around. In this talk we’ll look at how we can use standard technologies to extend Microsoft Teams on the desktop, online, or even on mobile applications. We will use the power of modern, cross-platform web development technologies to enhance and customise the users’ collaboration experience in a way that will seem natural and seamless. We’ll look at the full range of extension points including tabs, bots, connectors, webhooks and messaging extensions. Most importantly, we’ll see how we can deploy these solutions in a managed way. So many opportunities, so little time!