The Data without Boundaries (DwB) project, funded under the European Union 7th Framework Program (FP7), was conducted over 4 years, from May 2011 until the end of April 2015. It primarily aims at overcoming the main obstacles that slow down researchers' access to official microdata, too often underused, in particular for the highly detailed (so-called confidential) ones beyond each country's national borders. During its four-year lifespan the DwB worked towards preparing a comprehensive European service with better and friendly metadata, a more harmonized transnational accreditation and a secure infrastructure that would allow transnational access to the highly detailed and confidential microdata, both national and European, so that the European Union would be able to continuously produce cutting-edge research and reliable policy evaluations.