Arbor Networks Names Jack Boyle Chief Executive Officer.

LEXINGTON, Mass. -- Arbor Networks(R), a leader in network security, today announced the appointment of Jack Boyle as the company's chief executive officer. A successful and seasoned leader, Boyle joins Arbor Networks to further the company's market leading position in securing the world's most critical networks. Arbor Networks, which ended 2004 cash flow positive, is entering into its fifth straight year of continuous sales growth.

Boyle brings to Arbor a wealth of enterprise and service provider networking expertise and executive management experience, having built companies from startups to market leaders. Most recently, Boyle served as the president and CEO of EqualLogic, Inc., the market leader for intelligent, modular storage area networking (SAN) solutions, where he grew the company and led it through a successful Series C round of funding.

As chairman, president and CEO of Saville Systems, a developer of software billing systems, Boyle grew that company from 135 employees and $15 million in revenues to 1,800 employees and $185 million in revenues and a market cap in excess of $1 billion. He took the company public in 1995 and completed a secondary offering in 1996, splitting two times. He was appointed chairman of the board in 1998 and completed the successful sale of company to ADC Telecommunications in 1997.

"Jack has successfully led high growth companies and has served in senior executive positions from small startups to multi-national enterprises," said Dr. Farnam Jahanian, co-founder and chairman of Arbor Networks. "Jack's stewardship will enable Arbor to reach the next level as a strong and independent company. His arrival marks an exciting new chapter for Arbor."

Arbor Networks ensures the security and operational integrity of the world's most critical networks, including MCI, AT&T, British Telecom, NTT Com and Comerica Bank. Arbor's technology provides network-wide data collection, analysis, anomaly detection, and threat mitigation. The company's Peakflow(R) platform offers real-time views of network activity enabling organizations to instantly protect against worms, DDoS attacks, insider misuse, and traffic and routing instability, as well as segment and harden networks from future threats. Peakflow successfully prevents costly downtime, network cleanup, and loss of customer confidence.

"Joining Arbor provides an opportunity to continue to build on an already strong foundation," said Jack Boyle, CEO of Arbor Networks. "Arbor's technology is solving real security problems for enterprises, service providers, government agencies and educational institutions, all of which rely on their networks for communications and critical business processes. In a short period of time, Arbor has built a world-class roster of customers, partners and employees and Arbor is preventing some of the most harmful cyber attacks and threats out there today."

ABOUT ARBOR NETWORKS

Arbor Networks ensures the security and operational integrity of the world's most critical networks. Arbor's solutions are based on the proven Peakflow platform, intelligent technology for network-wide data collection, analysis, anomaly detection, and threat mitigation. Peakflow provides real-time views of network activity enabling organizations to instantly protect against worms, DDoS attacks, insider misuse, and traffic and routing instability, as well as segment and harden networks from future threats. Peakflow successfully prevents costly downtime, network cleanup, and loss of customer confidence. Arbor is headquartered in Lexington, MA, with a research and development office in Ann Arbor, MI and overseas headquarters in London and Beijing. For more information, go to www.arbornetworks.com.

Note to Editors: Arbor Networks and Peakflow are registered trademarks and the Arbor Networks logo and ArbOS are trademarks of Arbor Networks, Inc. in the USA and other countries. All other trademarks are the property of their respective owners.