Thomas Cook Set to Fly High with ATG

LONDON - March 4, 2009ATG (Art Technology Group, Inc. NASDAQ: ARTG), the premier provider of e-commerce solutions, announced that Thomas Cook UK & Ireland is using ATG to power their thomascook.com website. With the ATG Commerce platform, the site now offers highly personalised service and full transactional functionality to customers.

Thomas Cook UK & Ireland is the second largest leisure travel group in the UK with around 19,000 employees. The company operates a fleet of 43 aircraft, has a network of more than 800 high street stores (Thomas Cook and Going Places), leading websites (www.thomascook.com and www.airtours.co.uk), its own television channel Thomas Cook TV (Sky channel 655) and some of the world's favourite travel brands.

The Thomas Cook website required a scalable and reliable platform that would rapidly expand and change its sources of inventory, as well as integrate new features as and when required. It needed to improve its ability to innovate and change content and offers quickly to meet and exceed competitor offerings and customer expectations. In addition, Thomas Cook was looking to reduce the amount of bookings made online without offline intervention.

ATG's e-commerce technology platform provides Thomas Cook with an enhanced content management and merchandising system, enabling them to retain full control over the design, layout, and promotional content of the site. ATG Commerce ensures that Thomas Cook UK & Ireland can recognise new and repeat customers, providing personalised product offerings and more effective cross- and up-sell opportunities, through customer insight and behavioural tracking.

Russell Gould, Director of e-commerce at Thomas Cook UK & Ireland, says, "Today more people are choosing to shop online, and travel is becoming one of the most popular areas to make a Web purchase. We're seeing increased competition in the market, and have chosen to work with ATG to remain at the forefront of innovation, and to offer our customers the best online experience."

Frank Lord, ATG's regional vice president EMEA, comments, "The travel sector is in a prime position to benefit from all the advantages of effective e-commerce technologies, such as site search, personalised journey planning, and effective cross and up-sell opportunities. We're are looking forward to working more closely with Thomas Cook - a brand that is always striving to offer the best experience for its customers, both on and offline."

About Thomas Cook & Ireland:

Thomas Cook UK & Ireland is the second largest leisure travel group in the UK with around 19,000 employees. The company operates a fleet of 43 aircraft, has a network of more than 800 high street stores (Thomas Cook and Going Places), leading websites (www.thomascook.com and www.airtours.co.uk)), its own television channel Thomas Cook TV (Sky channel 655) and some of the world's favourite travel brands.

These brands include Airtours, Club 18-30, Cresta, CruiseThomasCook, Direct Holidays, Flexibletrips, flythomascook.com, Manos, Neilson, Panorama, Style Holidays, Sunset, Sunworld Holidays, Swiss Travel Service, Thomas Cook, Thomas Cook Signature, Thomas Cook Sport, Tradewinds, www.hotels4u.com and Elegant Resorts.

The company's airline, Thomas Cook Airlines flies from various regional airports to destinations worldwide.

Thomas Cook offers a range of financial services, including foreign exchange at competitive rates, the Thomas Cook Credit Card in conjunction with Barclays Bank, the cash passport and a wide range of travel insurance policies. It is the only major travel company to be FSA regulated for its travel insurance, which is underwritten by AXA. The company also owns White Horse Insurance Ireland Ltd.

Thomas Cook also has a leading publishing division, and currently has more than 150 guidebooks and publications on offer.

Thomas Cook UK & Ireland is part of Thomas Cook Group plc (www.thomascookgroup.com).

About ATG

ATG (Art Technology Group, Inc., NASDAQ: ARTG) makes the software and delivers the on demand solutions that the world's most customer-conscious companies use to power their e-commerce web sites, find prospects, convert them to buyers and ensure their satisfaction so they become loyal, repeat, profitable customers. ATG's B2C e-commerce suite is ranked the #1 current offering by Forrester Research, and powers more of the top 300 internet retailers than any other vendor. ATG's solutions are used by over 600 major brands, including Adobe, A&E Networks, American Eagle Outfitters, B&Q, Best Buy, Cingular Wireless, Coca Cola, Dell, DirecTV, France Telecom, Hewlett-Packard, Intuit, Johnson & Johnson, Louis Vuitton, Mercedes-Benz, Neiman Marcus, New York & Company, Nike, Nokia, OfficeMax, PayPal, Philips, Procter & Gamble, Rubbermaid, Smith & Hawken, Symantec, T-Mobile, Target, Urban Outfitters, Verisign, and Walgreens. The company is headquartered in Cambridge, Massachusetts, with additional locations throughout North America and Europe. For more information about ATG, please visit www.atg.com

2009 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 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