Chemical Manufacturer Rohm and Haas Selects USinternetworking to Deliver Ariba B2B Commerce Platform Solution via the ASP Model; USi Announces First Ariba iMAP Customer.

Business/Technology Editors

ANNAPOLIS, Md.--(BUSINESS WIRE)--June 27, 2000

USinternetworking, Inc. (USi)(Nasdaq:USIX), the leading Application Service Provider (ASP) today announced that Rohm and Haas (NYSE:ROH) has selected USi's e-Procurement ASP solution, powered by the Ariba(R) B2B Commerce Platform(TM). As a USi iMAP (Internet Managed Application Provider) client, Rohm and Haas will receive the best-in-class functionality of the Ariba Inc. (Nasdaq:ARBA) B2B eCommerce solution as part of a fully integrated, continuously supported, flat-rate monthly service via USi's advanced global network, the USi Global Services Platform (USiGSP(SM)).

"As one of the world's largest manufacturers of specialty chemicals, we have tremendous indirect purchase requirements," said Dave Espenshade, Vice President of Procurement at Rohm and Haas. "USi demonstrated that they could deliver the Ariba Buyer(TM) ASP edition in a managed, secure environment with an accelerated implementation schedule. This will help us integrate new and existing organizations, and facilitate a seamless transition from our legacy electronic- and paper-based systems to a fully automated, web-enabled system very quickly."

USi's hosted Ariba Buyer application will enable Rohm and Haas to electronically aggregate corporate purchasing from each employee desktop and direct spending to preferred suppliers and B2B marketplaces, resulting in higher-volume pricing and a more streamlined, efficient procurement process.

"Although dot.coms and emerging enterprises have helped to fuel the ASP movement, the ASP model also has great relevance for larger, established enterprises, particularly in the area of e-business," said Bill Martorelli, Vice President, e-Services and Sourcing at Hurwitz Group. "These larger enterprises should consider the ASP model not in terms of what they are already doing but as an enabler for new ways of doing business. USinternetworking, for one, has worked hard to allay potential areas of customer concern in the areas of security, performance and reliability, as well as customer service."

Rohm and Haas chose USi based on its enterprise experience, its expertise in managing legacy system integration, and its ability to deliver Ariba B2B eCommerce solutions via the ASP model. Rohm and Haas will also benefit from USi's world-class architecture comprised of comprehensive network infrastructure and monitoring, failover services and global data centers. In addition to an industry-leading Service Level Agreement, Rohm and Haas will receive best-practices implementation, consulting, hosting, management and 24x7 client services support.

"By selecting the Ariba Buyer solution from USi, Rohm and Haas can harness the power of the Internet to manage their commerce processes, alleviating expensive IT infrastructure and staffing resources while ensuring focus on their core business," said Dan Fishback, Vice President, Worldwide Channels with Ariba. "USi's fast implementation means a quicker return on investment for Rohm and Haas."

Added Christopher R. McCleary, USi Chairman and Chief Executive Officer, "We deliver the best solutions for enterprises such as Rohm and Haas that seek the business advantage of leading software applications without incurring the typical hassle and resource drain associated with deploying enterprise systems."

About Rohm and Haas

Rohm and Haas is a specialty chemical company whose products consistently improve the quality of life for people around the world. Rohm and Haas technology is found in paints and coatings, adhesives and sealants, household products, personal computers and electronic components, and construction materials. It also helps bring food to the table - fruits and vegetables - and salt, an essential ingredient for life.

Rohm and Haas has annual sales of more than $6.5 billion and employs more than 21,500 people. The company operates approximately 150 manufacturing and research sites in 25 countries around the world.

About Ariba, Inc.

Ariba, Inc. is the leading provider of B2B services and solutions to leading companies around the world, including more than 15 of the Fortune 100. The company delivers an open, end-to-end, best-of-breed platform of interoperable solutions to build B2B marketplaces, manage corporate purchasing, and electronically enable suppliers on the Internet. Together, Ariba's Internet services and software integrate commerce processes of B2B marketplaces, buyers, suppliers and commerce service providers to create global economies of scale for all participants. Ariba can be contacted at www.ariba.com.

About USinternetworking, Inc.

USinternetworking Inc. (Nasdaq:USIX) is a leading Application Service Provider delivering e-commerce and enterprise software as a service. The Company's iMAP portfolio of service offerings delivers the rich functionality of leading software from Ariba, BroadVision, Lawson, Microsoft, Niku, Oracle, PeopleSoft and Siebel as a continuously supported, flat rate monthly service via an advanced, secure global data center network. For more information, visit www.usi.net.

Internet Managed Application Provider, iMAP, AppHost, PriorityPeering, USiGSP, USiSAN USiAccelerate, and Making Software Simple are service marks of USinternetworking, Inc. All other trademarks are the property of their respective owners. USi strategic partners and providers are publicly traded on Nasdaq under the symbols: ARBA, BVSN, CSCO, MSFT, NIKU, ORCL, PSFT and SEBL.

Information in this release may involve expectations, beliefs, plans, intentions or strategies regarding the future. These forward-looking statements involve risks and uncertainties. All forward-looking statements included in this release are based upon information available to USinternetworking Inc. as of the date of the release, and we assume no obligation to update any such forward-looking statement. The statements in this release are not guarantees of future performance and actual results could differ materially from our current expectations. Numerous factors could cause or contribute to such differences. Some of the factors and risks associated with our business are discussed in the Company's registration statement on Form S-1 declared effective by the Securities and Exchange Commission ("SEC") on April 8, 1999, the Company's Form 10-Q filed with the SEC on May 15, 2000, and in our other reports filed from time to time with the SEC.

Ariba and the Ariba logo are registered trademarks of Ariba Inc. Ariba B2B Commerce Platform and Ariba Buyer are trademarks. All other trademarks are property of their respective owners.