PROMOTING THE PENGUIN: WHO IS ADVOCATING OPEN SOURCE SOFTWARE IN COMMERCIAL SETTINGS? Oliver Alexy TUM Business School Technische Universität München Arcisstr. 21, D – 80333 Munich, Germany phone: +49-89-28925741, fax: +49-89-28925742, email: alexy@wi.tum.de Joachim Henkel TUM Business School Technische Universität München Arcisstr. 21, D – 80333 Munich, Germany phone: +49-89-28925741, fax: +49-89-28925742, email: henkel@wi.tum.de 2nd affiliation: Center for Economic Policy Research (CEPR), London 1