ATG Announces the General Availability Of ATG 6.1.

Business Editors

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Sept. 22, 2003

New Release Includes Upgraded Web Content Management, Tighter

Integration with Leading Application Servers and Significant

Enhancements to ATG's Innovative Scenario Personalization

ATG (Art Technology Group, Nasdaq: ARTG), a leading provider of innovative software applications for commerce and customer self-service, today announced the general availability of ATG 6.1. ATG 6.1 is the latest upgrade to ATG's integrated set of applications designed to automate every facet of a company's online business and customer service initiatives. ATG 6.1 contains a variety of new capabilities including an upgraded Web content management solution, integration with industry leading application servers, and enhancements to ATG's innovative Scenario Personalization(sm) technology.

"In keeping with our company's innovation heritage, ATG 6.1 was developed in direct response to marketplace demands for solutions that reduce operational and IT costs," said Bob Burke, ATG president and CEO. "With ATG 6.1, new and existing customers have a comprehensive and cost-effective foundation for their commerce and self-service initiatives."

ATG has upgraded its cost-effective Web content management solution, ATG Publishing, with several flexible, easy-to-use features for companies utilizing database-driven Web applications such as portals, commerce and self-service. Organizations with frequent changes to marketing offers, product catalogs or service knowledge bases can receive substantial benefits from a solution like ATG 6.1. Unlike some content management applications that were designed for older Web sites with static content, ATG Publishing is a Web content management solution designed for today's dynamic Web-based information.

"Companies today are not only interested in updating online content in real-time, they need solutions that integrate into their existing infrastructure," said Kent Allen, eBusiness Research Director of industry analyst firm Aberdeen Group. "ATG's 6.1 release is also a viable option for companies that are looking for a flexible, easy-to-use publishing solution not found in many of the larger, more cumbersome content management systems available today."

ATG 6.1 offers tighter integration with Web application servers including IBM's WebSphere 5.0 and others. This improved interoperability and pre-integration with ATG's customer-facing applications can greatly reduce deployment and operational time and cost.

New and innovative capabilities in ATG 6.1 enable customers to automate business processes in the same manner as ATG's industry-renowned Scenario Personalization allows customers to automate customer interactions on the Web. Companies can now combine the power of both to build applications that integrate personalized customer interactions and core business processes while significantly differentiating their commerce, portal, and self-service initiatives.

With the new workflow functions in ATG 6.1, companies can automate repetitive manual business processes. Industry compliance issues, sales and marketing automation, customer and employee service management, and other highly complex processes can be automated through application workflow to save time and money while increasing productivity. The end result is an improved user experience tightly integrated with the business process.

"ATG 6.1 is an important step in the evolution of ATG's technology as companies continue to move their online business initiatives to a model of self-service," said Phil London, ATG senior vice president of products and technology. "As we move through the fourth quarter and into 2004, our product strategy will continue to be one that places the power of online business management in the hands of the business user, continuing to reduce cost of ownership and focusing on the automation of personalized self-service and commerce."

About ATG

ATG (Art Technology Group, Inc.) is a leading provider of innovative software applications for commerce and customer self-service. Customers around the globe rely on ATG for the frontline applications that help build and manage mutually beneficial relationships. Deployed on the industry's most popular application servers, ATG's application suites for e-commerce, portals, and relationship management are ideal for integrated e-business initiatives across the enterprise.

ATG has delivered e-business solutions to blue-chip companies worldwide including Aetna Services, Inc., Alcatel, American Airlines, Barclays Global Investors, Best Buy, BMG Direct, Eastman Kodak, Ford Motor Credit, HSBC, J. Crew, Sun Microsystems, Walgreen Company, and Wells Fargo. The company is headquartered in Cambridge, Massachusetts, with additional locations throughout North America, Europe, and Asia. For more information about ATG, please visit our Web site at www.atg.com.

(C) 2003 Art Technology Group, Inc. ATG and Art Technology Group are registered trademarks of Art Technology Group, Inc., and Scenario Personalization is its service mark. All other product names, service marks, and trademarks mentioned herein are trademarks of their respective owners.

This press release contains forward-looking statements for purposes of the safe harbor provisions under The Private Securities Litigation Reform Act of 1995. These statements involve known and unknown risks and uncertainties that may cause ATG's actual results, levels of activity, performance or achievements to be materially different from any future results, levels of activity, performance or achievements expressed or implied by such forward-looking statements. Important risk factors affecting ATG's business generally may be found in their periodic reports and registration statements filed with the Securities and Exchange Commission at www.sec.gov. Risk factors related to the subject matter of this press release include the possibility that the ATG product deployment will not be successful, on time or significantly enhance the user's Internet experience or handle user volumes; that those customers leveraging ATG won't have the opportunity to increase revenue and decrease future costs; the need to adapt to rapid changes so products do not become obsolete; the possibility of errors in ATG's software products; the possibility that the solution will not make customer implementations faster or more flexible or permit the customer to meet its customer-facing or infrastructure requirements; that the ATG product will not continue to be integrated with third party applications servers; that ATG's product strategy may change in the future; and the risks and costs of intellectual property litigation. ATG undertakes no obligation to update any of the forward-looking statements after the date of this press release.