Since the opening of the Central, Eastern and South Eastern European (CESEE) banking market, foreign banks, have started to invest in the financial sector of emerging economies. Economic research highlights that foreign banks have brought advanced technology, improved management expertise, upgraded risk management techniques and generally more efficient and competitive banking practices into CESEE countries (Clarke, Cull, Peria and Sànchez, 2002; Eller, Haiss and Steiner, 2006). However, there is hardly evidence about how this large-scale knowledge transfer has been achieved and what knowledge has actually been transferred. This paper intends to fill this gap. Two in-depth case studies of bank acquisitions by Austrian banks in CESEE give insight into the methods and content of knowledge transfer within the post-acquisition integration. A questionnaire sent out to CESEE subsidiaries of Austrian banks additionally provides information on the topic. The results show that knowledge transfer mainly occurs in international teams and during international meetings, trainings and development programs and that it is supported by information and communication technologies. Results further show that the content, methods and magnitude of knowledge transfer efforts change along the stages of post-acquisition integration. (author's abstract)