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ATG and TIBCO Software Form Strategic Alliance to Deliver Enterprise Integration Capabilities for ATG Dynamo Suite

Integration of ATG Dynamo and TIBCO Facilitates Unified Customer Management Solutions

NEW ORLEANS, (BUSINESS WIRE), April 19, 2001 - ATG (Art Technology Group, Inc., NASDAQ:ARTG), a provider of customer management and e–commerce applications, today announced a global alliance with TIBCO Software Inc. (NASDAQ:TIBX – news) to extend the reach of the ATG Dynamo® e–business Platform.

The alliance demonstrates strong commitment from both companies to develop, market, and sell enterprise application integration (EAI) products to customers looking for more efficient ways to deliver unified customer management solutions. EAI supports consistent customer management strategies by connecting business systems, customer databases, and enterprise information across all departmental functions and enterprise boundaries – including wireless, PDA and Web – to provide a single view of customers. By reducing the time and expenses required to integrate information and business processes between enterprise systems, ATG customers will increase profitability and improve efficiency across their organizations.

As part of the alliance, ATG and TIBCO(™) also will engage in global joint sales, marketing, and technology initiatives. ATG will license TIBCO technology as part of its ATG Dynamo EAI product offerings, enabling connectivity between ATG Dynamo and popular enterprise systems by vendors such as SAP, PeopleSoft, Siebel, and J.D. Edwards. The alliance also enhances ATG Dynamo's business-to-business (B2B) integration, enabling enterprises to interact with vendors, distributors, customers, and trading partners through popular B2B Internet standards, including RosettaNet, XML, and cXML.

"In today's competitive landscape, building and maintaining strong customer relationships is absolutely essential for survival,'' said Vivek Ranadivé, chairman and CEO of TIBCO Software(™). "ATG's leadership in providing highly–personalized, online customer relationship solutions, augmented by TIBCO's world–class integration solutions, will enable companies to automate business processes and operate more efficiently while developing and deepening the customer relationships that are crucial to any company's success."

"To maximize e–business investments, a company must select a platform that will adapt to existing infrastructure as well as technology innovations over time without costly, time consuming infrastructure overhauls," said Jeet Singh, CEO of ATG. "The alliance with TIBCO is a logical next step since ATG and TIBCO share the philosophy of delivering products that combine business value with the proven ability to build products that scale to customer needs. Customers can quickly connect their critical databases of customers, products, and transaction information and leverage them for their customer management and
e–commerce activities."

In support of ATG's annual user conference, TIBCO will be a Gold sponsor, and chairman and CEO, Vivek Ranadivé, will speak today at the ATG Open 2001 being held this week in New Orleans.

About ATG

ATG is a leading provider of customer management and e–commerce products and services. ATG offers an integrated suite of Java(™) application server–based products and services, as well as related application development, integration and support services. The ATG Dynamo® e–business Platform enables Global 2000 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.

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 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 ATG software will not work effectively with TIBCO's products; that the ATG and TIBCO products will not remain compatible or facilitate the integration between the ATG Dynamo software and the products of other vendors; and the risks and costs of intellectual property litigation. ATG undertakes no obligation to update any of the forward–looking statements after the date of this press release.

About TIBCO Software Inc.

TIBCO Software Inc. (Nasdaq:TIBX) is a leading provider of total business integration solutions delivering infrastructure software that enables companies to seamlessly integrate business systems in real time. TIBCO's products enable the real–time distribution of information through patented technology called The Information Bus™, or TIB®. TIBCO technology was first used to digitize Wall Street and has since been adopted in diverse industries including financial services, telecommunications, electronic commerce, transportation, logistics, manufacturing and energy. TIBCO's global customer base includes more than 1,000 customers such as Cisco Systems, Yahoo!, Ariba, NEC, Enron, Sun Microsystems, GE Capital, Philips, AT&T, Pirelli and AOL/Netscape. Headquartered in Palo Alto, Calif., TIBCO can be reached at +1 650 846 1000 or on the Web at www.tibco.com.

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TIBCO, TIBCO Software, TIBCO ActiveEnterprise, TIBCO ActiveExchange, TIB/BusinessConnect, TIB/BusinessConnect for RosettaNet, TIB/BusinessPartner, The Information Bus and TIB are trademarks or registered trademarks of TIBCO Software Inc.

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Legal Notice Regarding forward–looking Statements: This release contains forward–looking statements regarding TIBCO's business, customers, markets served or other factors including the ability of products to meet customers' expectations, needs, or perform as described that may affect future earnings or financial results. Our actual results could differ in such forward–looking statements. Reasons for why actual results could differ materially include if products are unable to successfully meet customers' expectations, needs, or perform as described. Additional information concerning factors that could cause our actual results to differ materially from those contained in the forward–looking statements can be found in TIBCO Software's filings with the Securities and Exchange Commission ("SEC"), including but not limited to its most recent reports on Forms 10–Q and 10–K filed with the SEC on April 12, 2001 and February 27, 2001 respectively, which identify important risk factors that could cause actual results to differ from those contained in the forward–looking statements including limited independent operating history, history of losses, unpredictability of future revenue, dependence on a limited number of customers, relationship with Reuters Group PLC, rapid technological and market changes, risks associated with infrastructure software and volatility of stock price. Copies of filings made with the SEC are available through the SEC's electronic data gather analysis and retrieval system (EDGAR) at www.sec.gov. TIBCO assumes no obligation to update the forward–looking statements included in this document.