Top Companies, Partners, and High-Tech Analysts to Join Forces at ATG Annual User Conference

Leaders from world's foremost brands will gather to explore the profit opportunities to be gained from creating a better customer experience across marketing, commerce, and customer service

CAMBRIDGE, MA., February 22, 2005 - ATG (Art Technology Group, Inc. NASDAQ: ARTG), the software provider behind the most consistent and relevant marketing, commerce, and service experiences, today announced that its annual user conference, ATG Insight Live 2005, will be held March 13-16 at the Hyatt Regency Coconut Point in Bonita Springs, FL. Executives from the world's best known consumer-facing companies, along with ATG partners and industry analysts, will converge to discuss ways they are gaining value from delivering a more targeted, integrated customer experience. Attendees will learn new, more effective ways to increase revenue through marketing, commerce, and customer service channels. They will also view ATG's latest business solutions and hear from industry analysts and other business leaders.

In November 2004, ATG, the leader in multi-channel marketing and commerce, announced its purchase of Primus Knowledge Solutions, the award-winning customer service and call center solutions provider. This year's ATG Insight Live offers the opportunity for customers and partners of both companies to discuss current business objectives and learn key strategies and tactics to drive towards a future where marketing, commerce, and customer service operate as a seamless and highly profitable customer experience.

Along with many technical tracks, attendees will learn:

How to increase response rates of marketing campaigns by making better use of customer purchase and service history
How to improve conversion rates of up-sell and cross-sell offers by tying them to marketing campaigns
How to not only reduce the cost of customer service encounters, but also turn those encounters into revenue opportunities

"ATG Insight 2005 is a tipping-point event for the ATG community, which includes our customers, prospects, and partners," said Bob Burke, president and CEO, ATG. "We are entering a new generation of e-business that moves beyond simple information silos and transaction silos to a fully integrated experience across the customer lifecycle, and across all customer touch points."

"Information, suggestions, offers, and answers will be timely, useful, and relevant to the customers' situation and stage in the lifecycle, continued Burke. "All customer interactions - from e-mail marketing to Web visits and purchases, to call center service - will be informed by preferences and previous interactions. Success will come to companies that deliver this rich and relevant cross-channel, cross-lifecycle experience to their customers, and we're thrilled to provide the ultimate, comprehensive forum to help build this next generation customer experience."

ATG Insight Live 2005 represents the premier gathering of experts and pioneers in creating the most relevant and compelling customer experiences. ATG customers will be on hand with ATG partners and industry analysts from Gartner, Forrester Research, Patricia Seybold Group, and others. Attendees participate in a series of business and technical sessions designed to foster an exchange of ideas around creating the ultimate customer experience using ATG's industry-leading customer experience platform. Attendees will hear from ATG customers such as Neiman Marcus, InterContinental Hotels Group, A&E Television Networks, Restoration Hardware, Merrill Lynch, Fujitsu, Conseco, Cabela's, and many more.

Keynote speakers at this year's event include Terry Jones, founder and former CEO, Travelocity.com, and John Thompson, senior vice president and general manager, BestBuy.com - an ATG customer. Jones brings first-hand knowledge of creating a national brand, thriving in rapidly changing markets, working across channels and life cycle stages, and using technology for competitive advantage.

Thompson is part of a management team at Best Buy that believes constant innovation is required to enhance the quality and profitability of the customer experience. Part of that innovation involves creating an experience that is more relevant to the unique needs of each customer segment Best Buy serves. Thompson will describe how Best Buy is experimenting with online and in-store "personas" as a way to maximize the customer experience, and he will examine Best Buy's results.

Additional agenda and registration information on ATG Insight Live 2005 can be found at www.atg.com/insightlive.

About ATGATG (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 Best Buy, Kingfisher, Neiman Marcus, Target, Friends Provident, Merrill Lynch, Wells Fargo, A&E Networks, Warner Music, AT&T Wireless, France Telecom, Philips, Procter & Gamble, Hewlett-Packard, American Airlines, InterContinental Hotels Group, US Army, and US Federal Aviation Administration. 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.

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?2005. ATG and Art Technology Group are registered trademarks, and ATG Insight, ATG Customer Experience and ATG Scenarios are propriety 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 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 business generally may be found in 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, but are not limited to, the following: the number of ATG customers may change; and the ideas and materials presented at the conference may not result in lasting profitable results for any particular customer or significantly improve end customer experiences. ATG makes no representations or warranties, express or implied, regarding any statement, omission or implication by any conference speaker and all views expressed are those of such speaker. ATG undertakes no obligation to update any of the forward-looking statements after the date of this press release.

Tucker Walsh
ATG
+1.617.386.1159
twalsh@atg.com