CONFORMED COPY THIRD AMENDMENT dated as of June 30, 1999 (this "Amendment"), to the Credit Agreement, dated as of September 29, 1998 (as amended, supplemented or otherwise modified from time to time, the "Credit Agreement"), among PSINET INC., a...Conformed Copy • July 14th, 1999 • Psinet Inc • Services-computer programming, data processing, etc. • New York
