The 12th international conference DisCo 2017: “Open education as a way to a knowledge society” was held from 26th June to 27nd June in Prague. We had 3 keynote speakers: Anastasia Syzenko, National University Taras Shevchenko Kiev, Petra Aczél, Corvinius University of Budapest and Irena Bifordová, Director of Education in Microsoft, Czech Republic. Over 90 participants from 15 countries took part in the conference. The speakers delivered over 40 presentations. Nearly 90% participants were from CEI countries. For the first time in the history of the DisCo conference our main partner was Microsoft, which hosted the conference in its own building. The conference program was opened by the welcoming speech of Jaroslav Fidrmuc, Deputy Minister of Ministry of Education, Youth and Sport, Czech Republic.