ATG Customers Best Buy and Neiman Marcus Win Awards for Excellence.

CAMBRIDGE, Mass. -- Retail Info Systems News Bestow Awards for Providing an Exceptional Customer Experience and for Having a Visionary Enterprise IT Strategy

ATG (Art Technology Group, Inc., NASDAQ: ARTG) the software provider behind the Web's richest customer experiences today announced that two of its customers, Best Buy and Neiman Marcus, have won 2005 Fusion Awards from Retail Info Systems News (RIS) magazine. The first annual awards recognized retail companies for excellence in fusing business strategy with IT implementation.

Neiman Marcus is a $3.5-billion retailer that includes such concept brands as Neiman Marcus, Bergdorf Goodman, Horchow and Chef's. The company was recognized with an award for Customer Experience. According to RIS Magazine, "The winners in the Customer Experience category recognize that while technology enhances and furthers a memorable shopping experience, they also know the process requires a heavy dose of high-quality, one-to-one interaction."

Best Buy, a $24.5 billion consumer electronics and entertainment company, won an award for their Enterprise IT Strategy. RIS magazine stated that winners in this category, "have established a vision focused on strategic differentiation, phased and prioritized by return on investment and an ideal end-state infrastructure."

Aside from the 2005 Fusion Awards, two other ATG customers received significant coverage in the October issue of RIS. The cover story featured ATG customer Casual Male which focused on their plans for future growth and ATG customer Finish Line was recognized as a Mid-market All Star in a special report.

About ATG

ATG (Art Technology Group, Inc., NASDAQ: ARTG) delivers innovative software to help high-end consumer-facing companies create a richer, more adaptive interactive experience for their customers and partners online and via other channels. ATG has delivered category-leading e-business solutions to many of the world's best-known brands including A&E Networks, American Airlines, AT&T Wireless, Best Buy, Fidelity Investments, France Telecom, Friends Provident, Hewlett-Packard, InterContinental Hotels Group, Kingfisher, Merrill Lynch, Neiman Marcus, Philips, Procter & Gamble, Target, US Army, US Federal Aviation Administration, Warner Music, 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 www.atg.com.

(C) 2004 Art Technology Group, Inc. ATG and Art Technology Group are registered trademarks of Art Technology Group, Inc. 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 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 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.