ATG Helps Bestofmicro Create New Online Commerce Environment for French High Technology Market; Leading Online Purchasing Guide Uses ATG Commerce to Re-launch B2C/B2B Site.

Business Editors/High-Tech Writers

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Oct. 15, 2003

ATG (Art Technology Group, Inc., Nasdaq: ARTG), a leading provider of innovative software applications for commerce and customer self-service, today announced that Bestofmicro, France's leading online purchasing guide for high technology products, has successfully re-launched its site on ATG Commerce.

With the help of French integrator PROGIWEB, Bestofmicro and ATG have created a flexible, scalable eCommerce environment that is equipped to handle Bestofmicro's evolving business needs. Business and consumer customers that visit the site enjoy a personalized, autonomous experience made possible by Bestofmicro's ability to constantly change and upgrade the site's capabilities through the use of ATG Commerce.

"Bestofmicro's influence and scale in both the French B2C and B2B arenas was expanding rapidly throughout 2002 and we needed a solution that could meet both our external consumer-facing needs as well as our back-office requirements," said Antoine Boulin, director of marketing, Bestofmicro. "ATG has allowed us to create an environment where we can constantly update the marketing and transactional aspects of the site based on the needs expressed by our customers."

Bestofmicro, which launched in 2000, experienced a sustained increase in site traffic for the first time in 2002, buoyed by a constantly expanding catalog and a host of new services. When the company merged with Italian search vendor BuyCentral, its need for a new commerce platform was clear. Thus far, the results achieved using ATG Commerce have been significant. The site has handled the increased traffic - Bestofmicro had 600,000 hits and two million pages scanned in July alone - while constantly adding new features such as competitive games and communications sites.

"As the European online buying experience continues to mature, companies such as Bestofmicro will place themselves ahead of the curve by creating the type of commerce environment they have achieved using ATG Commerce," said Andrew McInnes, vice president sales & field operations, ATG EMEA. "Bestofmicro has future-proofed its site, both on the front end and back, to deal with the evolving needs of the European customer."

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 ATG Commerce 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 needs of ATG's customer and its customers may change in the future; the possibility that the customer will not continue to upgrade its site to both business and consumer uses; the possibility that the catalogue business model of the customer may change; the possibility that European online commerce does not mature or grow; the possibility that the customer will be faced with unanticipated needs of European consumers that challenge the effectiveness of its current strategies; or the possibility that government regulation may adversely affect the customer's business model or results. ATG undertakes no obligation to update any of the forward-looking statements after the date of this press release.