We believe in Windows as a development platform, and we believe in our developers. Through open-source, we aspire to partner with the developer community to build better user experiences and learn from each other. We led with Calculator, because the app has such an interesting history, and we can’t wait to see where we can take this app, together. In this session, we talk about how we moved Windows Calculator to open source, leveraging technologies like Azure Pipelines for public builds and WinAppDriver for automated UI testing. We also discuss what we've learned from working in the open with the community, what we're working on next, and how you can get involved in the project.