Greek Retailer Public Chooses ATG to Launch New Online Store

LONDON - June 17, 2009 - ATG (Art Technology Group, Inc., NASDAQ: ARTG), the premier provider of e-commerce solutions, today announced Public stores will deploy the ATG Commerce Suite to launch their online shop in Greece and Cyprus.

The solution will enable Public stores to offer full-capability, personalised online stores, following their impressive physical store growth. ATG and partner Conexus will implement a comprehensive e-commerce solution, including integration with Public's back office systems. Public's goal is to provide its customers with a rich, personalised online interactive experience on their Greek language site, and a vast range of media and electronic products and services that can be purchased online.

"We want to offer our customers a state-of-the-art online interactive experience, where they can find the products and the services that they want via best-in-class personalisation technology, while also providing merchandising and campaign features that enable us to cater to each customer's specific needs," explains Robby Bourlas, Public Managing Director. "This is an advanced concept in Greece, where we are offering a truly sophisticated and tailored online service to our customers."

"This partnership demonstrates how ATG and Conexus can provide companies with a fully hosted, managed solution and total back office integration, in addition to the personalisation, search and merchandising capabilities of the e-commerce platform," says Conexus' Founding Director, Paul Sessions.

Frank Lord, vice president at ATG adds, "Retailers are finding that the online channel continues to be a growth area. ATG enables retailers to help their customers find what they need when they need it, while providing a unique brand experience that reinforces the retailer's market position. We are very pleased that Public is launching its online store with ATG and Conexus, and we look forward to the company's continued success."

About Public

Public is a chain of large entertainment stores selling products and services around technology and culture. The product range exceeds half a million products including computers and peripherals, TVs and video, MP3 and home audio, mobile phones and GPS, cameras and camcorders, software and gaming, books and comics, music and movies, toys and gadgets, design stationary, and more. Public currently has 5 stores in Greece and Cyprus with the flagship store on the Constitution Square of Athens, a 6-floor building of 50,000 sq ft. The company plans to expand in Bulgaria this summer and by 2012 to reach a total of 20 stores across all countries where it has a presence.

About Conexus

Conexus is a professional services organization providing consulting, development, and support services to help our partners and customers maximize the benefits of their investment in technology. Conexus has helped companies worldwide to articulate their visions and ensure that technology implementations solve core business challenges.

For more information, please go to www.conexus.co.uk.

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 maximise the success of their online businesses. The ATG Commerce application suite is the top-rated platform by industry analysts for powering highly personalised, efficient and effective e-commerce sites. The company's platform-neutral e-commerce optimisation 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.

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.

Tucker Walsh
ATG
+1.617.386.1159
twalsh@atg.com