Art Technology Group and Sun Microsystems Power Wireless Business-to-Business Solution.

Business/Technology Editors

CAMBRIDGE, Mass.--(BUSINESS WIRE)--June 6, 2000

ATG and Sun Strengthen Relationship by Delivering WAP-enabled

Solutions Built on ATG Dynamo(R) and Sun Solaris(TM)

Operating Environment Platform

Art Technology Group, Inc. ("ATG") (Nasdaq:ARTG), today announced that it is working with Sun Microsystems to deliver new WAP-enabled wireless customer relationship management solutions to global customers. In collaboration with MATERNA Information & Communications, one of Europe's leading systems integrators, ATG and Sun recently helped Schulte GmbH & Co KG deploy a multi-channel Business-to-Business (B2B) eCommerce site based on the ATG Dynamo Product Suite for personalized e-Commerce and the Sun Solaris(TM) Operating Environment. Additionally, ATG has joined Sun's iForce(sm) Solution Set for Mobile Wireless Internet, announced today, which provides enterprises, content providers and service providers with a flexible and powerful infrastructure to create, deliver and manage wireless-enabled portals and services.

The ATG Dynamo platform, in conjunction with the Solaris Operating Environment, provides companies with the flexibility and extensibility necessary to deploy true multi-channel eBusiness solutions. To survive today's fast-changing business environment, companies are required to provide multiple "touch points" for their customers, partners and suppliers whether it be through Web, email or, increasingly, a mobile phone. With ATG Dynamo, companies can leverage their existing infrastructure, business rules, customer data and content across all of these channels to increase their ROI and improve their customer relationships.

"ATG has been delivering online customer relationship management solutions for many years on the Sun(TM) platform," said Reed Hornberger, director of E-Commerce Market Development at Sun Microsystems, Inc. "Today, ATG and Sun are working together to better meet the wireless needs of our joint customers. ATG is an industry leader in enabling customers to extend its eCommerce initiatives into the wireless world."

"In today's mobile society, it has become increasingly important that companies reach out to customers using many different channels," said Joseph Chung, CTO, ATG. "Customers must be able to access information in whatever place and form they choose. ATG Dynamo provides companies with the platform necessary to meet their customer needs - fully leveraging the same business rules, content and customer information across all communication channels to drive rich customer relationships."

Wireless Solutions for Customers

MATERNA, a member of the ATG Solution Partner Program, is a leading developer of customer relationship solutions. MATERNA's expertise will allow organizations to take immediate action to develop and deploy wireless solutions that enable their customers and partners to conduct commerce anywhere and anytime with their mobile phone and PDA.

"Our customers want to be able to reach their customers wherever they are, not just when they are logged on to a land-based location," said Frank Ladwig, product marketing at MATERNA. "In developing the WAP-enabled solution for Schulte, we wanted to create a highly robust interactive relationship application that crosses multiple channels. By working closely with ATG and Sun, we were able to do just that."

"With the integrated solution developed by MATERNA we can directly implement all of our activities and processes for our customers on the Internet. This saves us capacity and time and, at the same time, means greater customer satisfaction," said Frank Wiesenfeller, director of information technology at Schulte.

About Art Technology Group

Art Technology Group, Inc. is a leading provider of Internet customer relationship management and electronic commerce products and services. ATG offers an integrated suite of Java(TM) application server-based products and services, as well as related application development, integration and support services. The ATG Dynamo(R) Product Suite enables Global 1000 enterprises, as well as new businesses using the Internet as their primary business channel, to understand, manage and build their online customer relationships and to more effectively market, sell and support their products and services over the Internet.

The Dynamo solution is designed to provide businesses with the core platform and software tools required to develop and deploy personalized, scalable and reliable e-commerce Web sites. Dynamo is licensed to over 300 customers including 3M, BabyCenter, BMG Direct, Eastman Kodak, Informix, J. Crew, Network Solutions, Sun Microsystems and TheStreet.com. The company is headquartered in Cambridge, Mass, with additional locations throughout North America and Europe.

Dynamo is a registered trademark of Art Technology Group, Inc.. Sun, Sun Microsystems and the Sun Logo are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries.

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 ATG's prospectus and in periodic reports and registration statements filed with the Securities and Exchange Commission. Risk factors related to the subject matter of this press release include the possibility that the Sun and ATG products will not be compatible, either now or in the future; that customers will encounter difficulties in implementing the two companies' software; that the wireless application will not function properly; that ATG will abandon support for the Sun system; unrealistic customer expectations; and the costs and risks associated with intellectual property infringement and litigation. ATG undertakes no obligation to update any of the forward-looking statements after the date of this press release.