ATG Launches Partner Early Access Program for ATG Commerce Suite 9.1.

Partners Preparing for General Availability

CAMBRIDGE, Mass. -- ATG (Art Technology Group, Inc., NASDAQ: ARTG), the premier provider of e-commerce solutions, today announced the launch of ATG's Early Access Program, designed to provide the company's global implementation partners with advance product access and training on future releases. By arming valued partners with the skills and technical knowledge necessary to help joint customers take full advantage of new features and capabilities built into ATG Commerce Suite, those customers will enjoy shorter implementation timelines and lower costs.

"The ATG Early Access Program will allow our partners to hit the ground running and help our customers take advantage of the latest capabilities in the ATG Commerce Suite. The program will allow partners extra time to familiarize themselves with the upcoming release prior to launch," said Bill Zujewski, vice president of product marketing, ATG. "ATG is committed to rapid and continuous technology innovation to drive cross-channel commerce. Early feedback from partners helps shape product roadmap and guide implementation efforts."

Global services firm Sapient (NASDAQ: SAPE), a long-standing ATG partner, is one of the first companies to participate in the ATG Early Access Program.

"We have a long history of working with ATG to build successful e-commerce businesses for our clients," stated Chris Davey, senior vice president, Sapient's Global Cross-Channel Commerce Practice. "Receiving early access to new version releases of the ATG Commerce Suite will benefit both Sapient and our clients by giving us the early preparation and enablement we need to provide high quality implementations on the latest ATG releases, and to do so both on time and on budget."

The ATG Commerce Suite is a comprehensive, flexible, highly scalable e-commerce solution that drives every phase of a personalized online shopping experience. By making shopping and buying more personal and fulfilling for consumers, ATG's cross-channel commerce capabilities yield higher conversion rates and order sizes. ATG enables merchants to centrally manage content, catalogs, and promotions to orchestrate customer experiences across channels. ATG Commerce Suite 9.1 enhances these merchandising capabilities, aligning merchant controls more closely with the way merchandisers manage catalogs, content, offers, and campaigns. It also includes new features that enable more cost effective and efficient implementations and integrations, new REST API's, which simplify integration with other applications as well as with newer user interface technologies like Adobe[R] Flex[R] and Flash[R] and other applications.

Available at the end of July 2009, ATG Commerce Suite 9.1 also enhances Commerce Service Center, ATG's personalized, integrated customer service application. Enhancements to this application include a stronger cross-channel foundation for applications in the agent center, on mobile devices, and in customer kiosks at physical stores.

About ATG

A trusted, global specialist in e-commerce, ATG (Art Technology Group, Inc., NASDAQ: ARTG) has spent the last decade focused on helping the world's premier brands maximize the success of their online businesses. The ATG Commerce application suite is the top-rated platform by industry analysts for powering highly personalized, efficient and effective e-commerce sites. The company's platform-neutral e-commerce optimization services can be easily added to any Web site to increase conversions and reduce abandonment. These services include ATG Recommendations and eStara Connections. The company is headquartered in Cambridge, Massachusetts, with additional locations throughout North America and Europe. For more information, please visit http://www.atg.com.

[c] 2009 Art Technology Group, Inc. ATG and Art Technology Group are registered trademarks. 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 its periodic reports and registration statements filed with the Securities and Exchange Commission at www.sec.gov.