When it comes to commercial Open Source adoption, things have certainly changed in the last 10 years. Exactly five years ago, Matthew Langham gave a talk at an Open Source conference about his work and experience in getting commercial organizations to understand the benefits of Open Source, from a vendor perspective as well as that of a consumer. Five years on, he will extend and revisit these insights, showing how large commercial organizations are now establishing their own internal Open Source communities to leverage and streamline their Open Source adoption and engagement. Using work at an integrated oil and gas supermajor as an example, he will describe the steps taken in establishing an internal Open Source community, the benefits and the lessons learned along the way.