WorldCom Partners with Internet Security Systems to Expand Global Managed Security Services Portfolio

Data Communications and Security Leaders Team to Provide Single-Source Solution to Business Customers Worldwide

LAS VEGAS, NETWORLD + INTEROP, May 7, 2002 - WorldCom (NASDAQ: WCOM), the leading global business data and Internet communications provider, and Internet Security Systems (NASDAQ: ISSX), a leading global provider of threat protection solutions, today announced a new agreement that significantly expands WorldCom's portfolio of managed security services.

Through this agreement, WorldCom is augmenting its existing suite of global security solutions with a broad range of best-in-class managed network protection, intrusion event monitoring, remote scanning, anti-virus, and emergency response services from Internet Security Systems. Together, the companies will deliver comprehensive security solutions to WorldCom customers with consulting and design, configuration and installation, maintenance, software upgrades, 24/7 management and monitoring, backup and restoration services provided by Internet Security Systems. Financial terms of the agreement were not disclosed.

"Joining forces with Internet Security Systems enables WorldCom to offer our customers the full array of dynamic threat protection solutions that provide multiple layers of defense from the network to the application layer," said Greg Moore, vice president of WorldCom Global Managed Services. "That capability, combined with the worldwide reach and reliability of our facilities-based network, means that customers around the globe can now turn to a single source - WorldCom - to meet all of their managed network and security requirements."

The new security solutions are suitable for any size company, from small businesses to large enterprises, seeking maximum network and data protection with optimum efficiency and value. By outsourcing their managed data networking and security solutions to WorldCom, companies can ensure the integrity and privacy of their business communications, avoiding the time and capital costs of self-managing these critical, highly specialized functions - allowing them to focus on their core business.

"Teaming Internet Security Systems with WorldCom creates a powerfully compelling value proposition for businesses around the world," said Tom Noonan, chairman and chief executive officer of Internet Security Systems. "The combination of our complementary services offers business customers access to complete networking and security solutions from acknowledged industry leaders in both fields. At the same time, it allows companies to leverage the benefits of simplicity, speed and efficiency that integrated managed services provide."

The ISS-provided services are an extension of WorldCom's existing portfolio of end-to-end security solutions, which includes managed firewall services, managed VPN services, authentication services, security consulting and training. Monitored and maintained through its Security Operations Center, WorldCom's security services organization is exclusively dedicated to developing and deploying managed security solutions, and providing its customers with around-the-clock support. WorldCom seamlessly manages data, IP and security services for its customers, ensuring the highest levels of security and performance. Managed security solutions are part of the full continuum of business communications products and services WorldCom provides to enterprises of all sizes around the globe.

About WorldCom Group

WorldCom Group (NASDAQ: WCOM) is a pre-eminent global communications provider for the digital generation, operating in more than 65 countries with annualized revenues exceeding $21 billion. With one of the most expansive, wholly owned IP networks in the world, WorldCom provides innovative data and Internet services for businesses to communicate in today's market. For more information, go to http://www.worldcom.com.

About Internet Security Systems

Founded in 1994, Internet Security Systems (ISS) (Nasdaq: ISSX) is a pioneer and world leader in software and services that protect critical information assets from an ever-changing spectrum of threats and misuse. As organizations increasingly move business operations online, the number and sophistication of threats to the networks, servers and desktops that empower these initiatives also continue to increase. Internet Security Systems' solutions dynamically detect, prevent and respond to these threats, making Internet Security Systems the trusted security provider for more than 9,000 corporate customers. These include 49 of the Fortune 50, the top 10 largest U.S. securities firms, 10 of the world's largest telecommunications companies and major agencies and departments within U.S. local, state and federal governments. Headquartered in Atlanta, GA, Internet Security Systems has additional operations throughout the Americas, Asia, Australia, Europe and the Middle East. For more information, visit the Internet Security Systems Web site at www.iss.net or call 888-901-7477.

###Forward-Looking Statements

This release, other than historical information, includes forward-looking statements made pursuant to the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995. Some of these forward-looking statements include those describing services provided through a partner. The risks and uncertainties which could cause actual results to differ materially from those in the forward-looking statements include, but are not limited to, the following: the level of demand for Internet Security Systems' (the Company) services; reliance on distribution channels through which the Company's services are sold; the growth in the acceptance and use of the Internet and of private Internet-based networks or "intranets"; the extent to which unauthorized access to and use of online information is perceived as a threat to network security; customer budgets; the assertion of infringement claims with respect to the Company's intellectual property; and risks concerning the rapid change of technology; and general economic factors. These risks and others are discussed in the Company's periodic filings with the Securities and Exchange Commission. These filings can be obtained either by contacting ISS Investor Relations or through the Securities and Exchange Commission's Web site at "http://www.sec.gov".

Internet Security Systems is a trademark of Internet Security Systems, Inc. All other companies and products mentioned are trademarks and property of their respective owners.