The target of this study is to assist EU-FOSSA in shaping the new EC open source software strategy. The study starts with a report on the status of open source software in the world, with emphasis on the developments after 2014 in the adoption of open source by public services and institutions. The fresh information that is presented helps identifying the weak and strong points of open source adoption by public organizations and it is used to review the current (2014-2017) EC open source software strategy. EC internal stakeholders are interviewed with the purpose of capturing their opinion on open source software adoption by the EC and their expectations for the future strategy. The document proceeds with a series of recommendations that are based both on the evidence collected worldwide and the feedback from the interviews. In particular, the study reports and advises on the extension of the EC strategy to EU institutions. The study concludes with a lessons learned section.