A key challenge for managing interorganizational relationships in high-tech sectors is to design information sharing practices for supporting cooperative activities without leaking competitive proprietary information. In this paper, we use a qualitative multi-case study to explore the role of communication in supporting cooperative information sharing while keeping competitive information concerns at bay. We study two contrasting dyads of a Taiwanese buyer and Korean supplier in the digital home entertainment industry — one which was a successful interorganizational relationship and led to further collaboration and the other which was unsuccessful and thus terminated. Drawing insights from Media Synchronicity Theory (MST), we develop a process model that explores the combination of communication media with communication content and processes for effective (ineffective) communication that promotes trust, information sharing and open communication in successful (unsuccessful) interorganizational relationships.