CONFORMED COPY THIRD AMENDMENT dated as of May 31, 2001 (this "Amendment"), to the Credit Agreement, dated as of June 3, 1999, as amended (the "Credit Agreement"), among RCN CORPORATION, (the "Company"), RCN TELECOM SERVICES, INC. (formerly known as...Third • August 14th, 2001 • RCN Corp /De/ • Telephone communications (no radiotelephone) • New York
