ABOVENET PROVIDES HIGH BANDWIDTH CONNECTIVITY SOLUTIONS FOR CACI INTERNATIONAL OFFICES AND DATA CENTER

Rapid Deployment by AboveNet Meets Deadline and Ensures Seamless Transition Of 1,000 Employees and 1,000 Servers to New Location

WASHINGTON, D.C., March 30, 2010 – AboveNet, Inc. (NYSE:ABVT), a leading provider of high bandwidth connectivity solutions, today announced the successful deployment of fiber optic infrastructure solutions for CACI International Inc to support new corporate facilities in Virginia. CACI provides professional services and IT solutions in the defense, intelligence, homeland security and federal civilian government arenas.

CACI now is using AboveNet high bandwidth connectivity solutions to link its new employee campus and data center with other CACI locations in the Washington, D.C. Metro Region. AboveNet’s solutions meet CACI’s requirements for reliable, low latency high bandwidth connectivity supporting the full range of the company’s mission-critical business data communications needs.

AboveNet deployed the network in under 100 days, meeting CACI’s deadline for installation, and helping to ensure the timely, successful move of more than 1,000 employees to the new campus and 1,000 servers to a new data center, without work interruption.

“We are very pleased by the opportunity to serve CACI, and we look forward to a long, productive relationship with this valued client,” said Matt Johns, Director of Mid-Atlantic Sales at AboveNet. “This highly successful project is illustrative of the work we perform consistently for all our customers. Businesses look to AboveNet as the industry benchmark in providing high bandwidth connectivity solutions cost-effectively, on or ahead of schedule.”

About AboveNet, Inc.
AboveNet, Inc. provides high bandwidth connectivity solutions for business and carriers. Its private optical network delivers key network and IP services in and among top U.S. metro markets and globally. AboveNet's network is widely used in demanding markets such as financial services, media, health care, retail and government.

About CACI
CACI provides professional services and IT solutions needed to prevail in the defense, intelligence, homeland security, and federal civilian government arenas. We deliver enterprise IT and network services; data, information, and knowledge management services; business system solutions; logistics and material readiness; C4ISR integration services; cyber solutions; integrated security and intelligence solutions; and program management and SETA support services. CACI services and solutions help our federal clients provide for national security, improve communications and collaboration, secure the integrity of information systems and networks, enhance data collection and analysis, and increase efficiency and mission effectiveness. CACI is a member of the Fortune 1000 Largest Companies and the Russell 2000 index. CACI provides dynamic careers for approximately 12,800 employees working in over 120 offices in the U.S. and Europe. Visit CACI on the web at www.caci.com and www.asymmetricthreat.net.

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This news release contains forward-looking statements that involve risks and uncertainties. Factors that could cause or contribute to such risks and uncertainties include, but are not limited to, general economic and business conditions, competition, changes in technology and methods of marketing, and various other factors beyond the Company’s control. This also includes such factors as are described from time to time in the SEC reports filed by AboveNet, Inc., including the most recently filed Form 8-K.