At the Westsächsische Hochschule Zwickau, the trinational master program Regional and Eu-ropean Project Management was successfully established in cooperation with the Université de Bretagne Sud (France) and the Jihočeská Univerzita v Českých Budějovi?cích (Czech Re-public). The cooperation of all partners started in 2012. The international project group com-municated primarily via e-mail. With the start of the project in 2012 all data of e-mail commu-nication of the cooperation partners was stored. This collection of e-mails is an authentic and also specific communication material representing a successful project. It is specific for the reason that it is a multilingual communication on the one hand; on the other hand, the data backup over several years provides the possibility to analyze the communications in their de-velopment and sequentiality. With this material, a central topic of project management can be investigated: the project communication. In project management it has been documented sev-eral times that project communication plays a key role in the project's success. On the basis of the complex material described above, I will examine in this analysis the following question: What makes multilingual and intercultural project communication by e-mail successful? After embedding the research subject into the theoretical context, the project work and project control are analyzed in the context of a qualitative analysis. Based on eleven, primarily induc-tive developed analysis categories; four success-promising features can be worked out. These are the combination of e-mail communication with other forms of communication; the prac-ticed multilingualism; the developed group-identity and the changing leadership responsibility within the project group.