Extending Office Add-ins with the Azure Container Service discusses using containers and the Azure Container Service to deploy Office Add-ins. Containers provide lightweight virtualization that simplifies building, shipping, and running applications. The Azure Container Service is optimized for hosting containers at large scale and includes Docker Swarm and DC/OS for container orchestration. It then demonstrates connecting an Office Add-in running in a container to an Office 365 group and deploying containerized add-ins with automated builds on the Azure Container Service.