Visual Studio 2015 came out in July 2015, and with it, a new version of F# - version 4.0! Carl and Richard talk to Lincoln Atkinson, late of Microsoft, about the cool new features and capabilities in F# 4. The conversation ranges through the thinking around functional programming and new very functional features added - like TryList, as well as the more hybrid capabilities that let F# be a more general purpose language. And most impressively, F# 4.0 was built out in the open, as an open source project, including having third party contributors. Sure, the bulk was built by Microsoft folks (including Don Syme), but check out the contributors list!