Internet Security Systems Proventia Desktop Positioned in Leaders Quadrant in Research Analyst Firm's Magic Quadrant Report

Internet Security Systems (ISS) (NASDAQ: ISSX), the
worldwide leader in preemptive, enterprise security, today announced
that technology research firm, Gartner, Inc., has listed Proventia(R)
Desktop Endpoint Security in the leaders quadrant in its Personal
Firewall Magic Quadrant(1) for the first quarter of 2006. According to
the Magic Quadrant report, personal firewalls will be an integral part
of client computing by 2010.(2)
   "We believe our positioning in Gartner's Personal Firewall Magic
Quadrant demonstrates the industry's confidence in the
market-differentiating preemptive approach that ISS takes to protect
organizations from zero day threats and undefined viruses," said Greg
Adams, vice president of product management at Internet Security
Systems. "By trapping malicious behavior rather than relying on rules
or signatures, Proventia Desktop protects customers from spyware and
more than 97 percent of new and unknown viruses and worms without
blocking healthy traffic."
   Proventia Desktop, with its patent-pending ISS Virus Prevention
System, automatically protects desktops and mobile devices against
known and unknown threats by utilizing multi-layered security
technologies. It includes a personal firewall that blocks unauthorized
access not required for legitimate business needs. Proventia Desktop
offers preemptive protection that works ahead of Internet threats to
block attacks before they cause outages, employee downtime, excessive
calls to the help desk or the compromise of critical information.
   The ISS Proventia product line is a multi-layered security
solution that provides comprehensive protection from network- and
host-based attacks before they impact business assets, which is
complemented by ISS Managed Security Services and Professional
Security Services.
   The Gartner Magic Quadrant is a graphical portrayal of vendor
performance in a market segment, including categories for leaders,
challengers, visionaries and niche players. It is organized based on
companies' ability to execute in a space, as well as their
completeness of vision in the market.
   For additional information on ISS Proventia Desktop visit:
http://iss.net/products/product_descriptions/Proventia_Desktop/index.
html. (Due to its length, this URL may need to be copied/pasted into
your Internet browser's address field. Remove the extra space if one
exists.)

   About Internet Security Systems, Inc. 

   Internet Security Systems, Inc. (ISS) is the trusted security
advisor to thousands of the world's leading businesses and
governments, providing preemptive protection for networks, desktops
and servers. An established leader in security since 1994, the ISS
integrated security platform automatically protects against both known
and unknown threats, keeping networks up and running and shielding
customers from online attacks before they impact business assets. ISS
products and services are based on the proactive security intelligence
of its X-Force(R) research and development team - the unequivocal
world authority in vulnerability and threat research. The ISS product
line is complemented by comprehensive Managed Security Services and
Professional Security Services. For more information, visit the
Internet Security Systems Web site at www.iss.net or call
800-776-2362.
   Internet Security Systems is a trademark and X-Force and Proventia
are registered trademarks of Internet Security Systems, Inc. All other
companies and products mentioned are trademarks and property of their
respective owners.
   1 - The Magic Quadrant is copyrighted June 2006 by Gartner, Inc.
and is reused with permission. The Magic Quadrant is a graphical
representation of a marketplace at and for a specific time period. It
depicts Gartner's analysis of how certain vendors measure against
criteria for that marketplace, as defined by Gartner. Gartner does not
endorse any vendor, product or service depicted in the Magic Quadrant,
and does not advise technology users to select only those vendors
placed in the "Leaders" quadrant. The Magic Quadrant is intended
solely as a research tool, and is not meant to be a specific guide to
action. Gartner disclaims all warranties, express or implied, with
respect to this research, including any warranties of merchantability
or fitness for a particular purpose.
   2 - Gartner, Inc., Magic Quadrant for Personal Firewalls, 1Q06,
John Girard, June 2006