Avici Boots Kaufman; Leighton Steps Up

NORTH BILLERICA, Mass. -- Avici Systems Inc. (NASDAQ: AVCI - News), today announced that its Board of Directors has appointed Dr. William Leighton, a current member of Avici's Board, to serve as interim Chief Executive replacing Steven Kaufman. Surya Panditi, Chairman of the Board, commented, "the Board's decision was prompted by the rapidly changing landscape in the telecommunications equipment business."

Mr. Panditi continued, "I am very pleased that Bill has chosen to accept this role under difficult circumstances. Bill's background and expertise in network research and design, and in the development of IP networks and services is exceptionally well suited to guide Avici's strategic direction going forward."

Dr. Leighton joined Avici's Board in May of this year upon retirement from AT&T where he spent 27 years at AT&T Labs and Bell Labs. Most recently, Dr. Leighton served as Vice President of Research, and previously as Vice President of Network Development, where he led the design and development of AT&T's IP and data networks and services.

Avici Systems Inc.