Arbor Networks Named One of New England's Fastest Growing Technology Companies in Deloitte's Technology Fast 50 Program.

LEXINGTON, Mass. -- Attributes Security Expertise and Leadership to its 11,440 % Revenue Growth

Arbor Networks(R), a provider of core-to-core network security and operational performance for global business networks, has been named to Deloitte's prestigious Technology Fast 50 Program for New England, a ranking of the 50 fastest growing technology, media, telecommunications and life sciences companies in the area by Deloitte & Touche USA LLP, one of the nation's leading professional services organizations. Rankings are based on the percentage revenue growth over five years from 2001-2005.

"We are honored to be recognized for the second year in a row for our strong performance over the past five years," said Arbor Networks CEO Jack Boyle. "We remain committed to delivering innovative technologies and core-to-core network security and operational performance to dramatically improve how our customers secure their networks. We look forward to growing our product line and brand name, as well as increasing our channel distribution, our partnerships and our market share in the coming year."

Arbor Networks increase in revenues of 11,440 % from 2001 to 2005 resulted in a number two ranking in the Technology Fast 50 for New England. The average increase in revenues among companies who made the Technology Fast 50 for this region was 1,825 percent.

The company's success is also based on an accumulation of product enhancements, industry research, strategic partnerships, an innovative multimedia marketing campaign, growing its employee base by 30 percent, and expanding its presence into 48 countries, according to Boyle.

To qualify for the Technology Fast 50, companies must have had operating revenues of at least $50,000 in 2001 and $5,000,000 in 2005, be headquartered in North America, and be a company that owns proprietary technology or proprietary intellectual property that contributes to a significant portion of the company's operating revenues; or devotes a significant proportion of revenues to the research and development of technology. Using other companies' technology or intellectual property in a unique way does not qualify.

Winners of the 16 regional Technology Fast 50 programs in the United States and Canada are eligible to be entered into the Deloitte's Technology Fast 500 program, which ranks North America's top 500 fastest growing technology, media, telecommunications and life sciences companies. For more information on Deloitte's Technology Fast 50 or Technology Fast 500 programs, visit www.fast500.com.

About Arbor Networks

Arbor Networks(R) delivers core-to-core network security and operational performance for global business networks. Arbor's Network Behavioral Analysis (NBA) solutions are based on the Arbor Peakflow(R) platform, providing 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.

Today, Arbor Networks' customer base is comprised of a broad range of service provider and enterprise customers within a variety of industries spanning the globe, demonstrating the depth and breadth of Arbor Networks security expertise. All rely on the Arbor Peakflow platform to prevent costly downtime, enable network cleanup, and increase customer trust.

To learn more about Arbor Networks, please visit: http://www.arbornetworks.com.

And, to learn more about the Arbor Security Engineering & Response Team (ASERT) - the company's security research arm - please visit the ASERT blog: http://asert.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.

About Deloitte

Deloitte refers to one or more of Deloitte Touche Tohmatsu, a Swiss Verein, its member firms and their respective subsidiaries and affiliates. As a Swiss Verein (association), neither Deloitte Touche Tohmatsu nor any of its member firms has any liability for each other's acts or omissions. Each of the member firms is a separate and independent legal entity operating under the names "Deloitte", "Deloitte & Touche", "Deloitte Touche Tohmatsu" or other related names. Services are provided by the member firms or their subsidiaries or affiliates and not by the Deloitte Touche Tohmatsu Verein.

Deloitte & Touche USA LLP is the US member firm of Deloitte Touche Tohmatsu. In the US, services are provided by the subsidiaries of Deloitte & Touche USA LLP (Deloitte & Touche LLP, Deloitte Consulting LLP, Deloitte Financial Advisory Services LLP, Deloitte Tax LLP and their subsidiaries), and not by Deloitte & Touche USA LLP.