ArcSight to Participate in "Future of Security Incident and Event Management" Panel at RSA Conference 2008

Market Wire, April, 2008

WHO:          Hugh Njemanze, CISSP, chief technology officer and executive
              vice president of research development at ArcSight
              (NASDAQ: ARST), will participate in the "Future of Security
              Incident and Event Management" panel at the RSA Conference
              2008 on Friday, April 11, 2008, from11:10 a.m. to 12:00 p.m.
              PDT.

              Njemanze will be joined by senior technologists from SIEM and
              network management vendors IBM; CA, Inc.; and NetIQ. Tim
              Mather, chief security strategist at RSA, the Security
              Division of EMC, will moderate the panel.

              Njemanze co-founded ArcSight in May 2000 and has served as
              CTO and executive vice president of research development
              since March 2002.

WHAT:         RSA Conference 2008, taking place April 7-11 in San
              Francisco, CA, is a comprehensive educational forum in
              information security. Featuring over 350 exhibitors and more
              than 220 educational sessions and live demos, RSA provides
              attendees with access to learn about the latest trends and
              technologies, best practices and perspectives on the most
              business critical issues facing information security
              professionals today.

              As part of the "Future of Security Incident and Event
              Management" panel, Njemanze will participate in a discussion
              on the convergence of security and network management into
              SIEM technology.

WHEN & WHERE: Technical Futures - "Future of SIEM"
              April 11, 2008, at 11:10 a.m. PDT
              Red Room 301

              RSA Conference 2008
              Moscone Convention Center
              747 Howard Street
              San Francisco, CA 94103

              ArcSight Exhibit: Booth #1756

              For more information, or to register for RSA, visit
               www.rsaconference.com .

              For a list of additional events where ArcSight will be in
              attendance, visit  www.arcsight.com .

About ArcSight

ArcSight (NASDAQ: ARST) is a leading global provider of compliance and security management solutions that protect enterprises and government agencies. ArcSight helps customers comply with corporate and regulatory policy, safeguard their assets and processes, and control risk. The ArcSight platform collects and correlates user activity and event data across the enterprise so that businesses can rapidly identify, prioritize, and respond to compliance violations, policy breaches, cybersecurity attacks, and insider threats. For more information, visit www.arcsight.com .

ArcSight and the ArcSight logo are trademarks of ArcSight, Inc.