How does Microsoft maintain mature applications? Carl and Richard talk to Dustin Metzgar about his work at Microsoft maintaining applications and libraries like Windows Workflow, older versions of ASP.NET and Entity Framework and more. These products are maintained for a long time, typically without adding features, but rather to make sure new operating systems still work with them, security is maintained and bugs are fixed. There's a ton of cool stories in this space, it's the ultimate brownfield project challenge - rarely, if ever, do folks who created a product continue with it throughout it's life time!