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Symantec Certifies Clearswift Solutions As Interoperable With The Symantec Antivirus Scan Engine

Symantec Certifies Two Additional Clearswift Products -MIMEsweeperä for Web and ES ClearEdge™

CUPERTINO, Calif. and LONDON, UK - February 18, 2004 - Symantec Corp. (Nasdaq: SYMC), the world leader in Internet security, and Clearswift, a leading supplier of content filtering software, today announced that Symantec has certified Clearswift's MIMEsweeper for Web 5.0 and ES ClearEdge 4.9 for Windows NT/2000 as interoperable with the Symantec AntiVirus Scan Engine. These certifications follow Symantec's certification of the MAILsweeperä for SMTP 4.3 that took place in March 2003. All three Clearswift solutions are certified through the Symantec Technology Partner Program and are supported by Symantec AntiVirus 4.3 for Clearswift, scheduled to be available the week of March 1, 2004.

Symantec AntiVirus 4.3 for Clearswift detects and protects against viruses, worms, and Trojan horses in all major file types, including mobile code and compressed file formats. Utilizing development tools available within the Symantec Technology Partner Program, Clearswift developed an interface to the Symantec AntiVirus Scan Engine that enables email and Web traffic passing through its MAILsweeper for SMTP 4.3, MIMEsweeper for Web 5.0 and ES ClearEdge 4.9 for Windows NT/2000 to be automatically scanned for viruses.

"Email communications bring with them a host of security challenges that run the breadth from viruses to worms and Trojan horses," said Brian Burke, research manager at IDC. "With the destructive payloads that we've seen coming across the transom, it makes sense to augment defenses by layering different types of security together to protect corporate networks. Combining antivirus with content security helps organizations plug the holes that may exist in their security systems in a more reliable way."

"Clearly the market is concerned with addressing a broad breadth of security issues and offering anti-virus with content security solutions bundled together provides more of a multi-layered security solution. These solutions are complimentary and our customers will appreciate the value of an integrated solution from two market-leading vendors," said Greg Hampton, vice president of US marketing at Clearswift.

"Protecting messaging and Web gateways from malicious code and unwanted content provides the enterprise with a first line of defense against malicious attacks," said Steve Cullen, senior vice president, Symantec Enterprise Solutions. "The expanded Symantec AntiVirus for Clearswift solution provides seamless integration of mission critical services to provide advanced, multi-layer protection against viruses before they can invade enterprise networks." Clearswift joined the Symantec Technology Partner Program in January 2003. The Symantec AntiVirus Scan Engine Software Development Kit provides the tools for third party technology partners to integrate Symantec's antivirus technology into their server applications and network devices.

Availability
Symantec AntiVirus 4.3 for Clearswift, which includes the complete Symantec AntiVirus Scan Engine software that supports all three Clearswift solutions, will be available for Microsoft Windows 2000 and 2003, Red Hat Linux and Sun Solaris and will be sold through Symantec sales channels. Trialware, licensing and reseller information can be found at http://enterprisesecurity.symantec.com.

Clearswift has developed and distributes separate software interfaces that enable interoperability between their products and Symantec AntiVirus 4.3 for Clearswift. The Symantec AntiVirus connector is available as a free download from the Clearswift Web site and is required for support of MAILsweeper for SMTP 4.3. An appropriate software interface is distributed with MIMEsweeper for Web 5.0 and ES ClearEdge 4.9 and no special download is required. The Clearswift solutions are now available from Clearswift for Microsoft Windows 2000 and 2003. For information please call: 1-800-982-6109 or link to www.clearswift.com.

MAILsweeper™ for SMTP 4.3
MAILsweeper for SMTP analyzes incoming and outgoing email at the Internet gateway, allowing organizations to implement management and security policies to block inappropriate emails, comply with legal requirements, and increase user productivity.

MIMEsweeper™ for Web 5.0
MIMEsweeper for Web is one of the most powerful and comprehensive Web filtering solutions available today. It provides much more than URL blocking and enables organizations to implement and enforce a Web usage policy to control content downloaded from, and uploaded to, the Web. MIMEsweeper™ for Web works in tandem with firewall and anti-virus solutions to provide a comprehensive security solution that guards against breaches in confidentiality and other threats such as damage to reputation, lost productivity, pornography, theft of data, legal liability, degradation in service and data corruption.

ES ClearEdge™ 4.9
SMTP email has become the communication standard for a large portion of electronic information flow between organizations. Organizations increasingly rely on this business communication medium but need management and policy enforcement to detect, block and remove inappropriate email, comply with legal requirements and increase user productivity.

Symantec AntiVirus Scan Engine
Symantec AntiVirus Scan Engine provides fast, scalable, and reliable virus protection for traffic served through, or stored on, network infrastructure devices. Employing award-winning Symantec antivirus technologies optimized for high performance and rapid deployment, the solution is easily integrated into server software applications and networking systems through support for the ICAP protocol.

Symantec Technology Partner Program
The Symantec Technology Partner Program establishes standards for how diverse security and infrastructure products from multiple vendors can work together with Symantec technologies to simplify complex enterprise networks for joint customers. The Technology Partner Program offers comprehensive integration tools, development support, joint sales and marketing resources, and product certification for those partners interested in integrating with Symantec's industry-leading security solutions and the Symantec Enterprise Security Architecture. Partners whose solutions meet Symantec's established criteria for interoperability earn the use of applicable Symantec certification logos. Detailed information on the program procedures, requirements and benefits can be found at www.symantec.com/technologypartners.

About Clearswift
Clearswift is the world's leading provider of software for managing and securing electronic communications. Clearswift solutions ensure business compliance through safe messaging, secure boundaries and best practice in electronic communications. Clearswift delivers the capabilities for organizations to protect themselves against email and web-based threats, meet legal and regulatory requirements, implement productivity-saving policies and manage intellectual property passing through their network.

More information about Clearswift, its products and services is available at www.clearswift.com.

About Symantec
Symantec is the world leader in providing solutions to help individuals and enterprises assure the security, availability, and integrity of their information. Headquartered in Cupertino, Calif., Symantec has operations in more than 40 countries. More information is available at www.symantec.com.

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