Ariba Enhances Supplier Connectivity Solution; Company Receives ''Powered by NetWeaver®'' Qualification, Enabling Customers to Connect to the Ariba Supplier Network Faster and Easier Than Ever Before

Business Wire, May 16, 2006

SUNNYVALE, Calif. -- Ariba(R), Inc. (Nasdaq:ARBA), the leading spend management solutions provider, today announced that it has attained "Powered by SAP NetWeaver(R)" status for the Ariba Supplier Network(TM), a leading global network for connecting enterprises with their supplier communities. With the qualification of the Ariba Supplier Connectivity(TM) ASC Adapter version 1.0, Ariba can seamlessly link with mySAP(TM) Business Suite applications and help companies using them reduce the cost and simplify the process of connecting, transacting, and collaborating with their suppliers around the globe.

"In today's global economy, buyers and suppliers must be able to easily connect to and transact business with suppliers in an efficient and cost-effective manner regardless of the procurement platform they are using," said Bob Solomon, Senior Vice President, Growing Enterprise Business, Ariba. "Last year, we opened the Ariba Supplier Network to provide companies using ERP procurement solutions with more options to solve their supplier connectivity challenges. Our Powered by NetWeaver qualification is a natural expansion of this strategy."

With more than 140,000 registered suppliers in 115 countries engaging in transactions worth more than $90 billion a year, the Ariba Supplier Network is one of world's largest business transaction networks. Each month, participating buyers and suppliers conduct business with each other electronically, managing the complete procure-to-pay cycle -- from sourcing to orders, to invoices, and payment. More than 25 million purchase orders and invoices were carried across the network in 2005.

In launching the Ariba Supplier Connectivity(TM) solution last year, Ariba made it possible for all companies using ERP and other non-Ariba applications to reap the benefits that the Ariba Supplier Network provides. By linking to the network, companies can access pre-enabled suppliers, bring more of their spend under management, and maximize the returns on investment in existing systems.

Ariba Supplier Connectivity is a subscription-based solution that combines software and services to deliver immediate benefits to both buyers and suppliers. Buyers benefit from the large, existing supplier community already connected and engaged in electronic commerce over a secure global infrastructure. Suppliers benefit from pre-established links to the procure-to-pay cycle of leading global companies and a more reliable order-to-cash cycle.

SAP NetWeaver is the integration and application platform that facilitates the integration and alignment of people, information, and business processes across organizational and technological boundaries. By enabling a seamless integration between the SAP NetWeaver platform and its network, Ariba Supplier Connectivity ASC Adapter version 1.0 can increase supplier connectivity for SAP customers with a streamlined, out-of-the-box integrated adapter for the SAP NetWeaver Exchange Infrastructure.

For more information on Ariba Supplier Connectivity, the Ariba Supplier Network, and the value that they deliver, please visit: www.ariba.com

About Ariba, Inc.

Ariba, Inc. is the leading provider of Spend Management solutions to help companies realize rapid and sustainable bottom line results. Successful companies around the world in every industry use Ariba Spend Management software and services. Ariba can be contacted in the U.S. at 1.650.390.1000 or at www.ariba.com.

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Safe Harbor Statement under the Private Securities Litigation Reform Act 1995: Information and announcements in this release involve Ariba's expectations, beliefs, hopes, plans, intentions or strategies regarding the future and are forward-looking statements that involve risks and uncertainties. All forward-looking statements included in this release are based upon information available to Ariba as of the date of the release, and we assume no obligation to update any such forward-looking statements. These statements are not guarantees of future performance and actual results could differ materially from our current expectations. Factors that could cause or contribute to Ariba's operating and financial results to differ materially from its current expectations include, but are not limited to: delays in development or shipment of new versions of Ariba's products and services; lack of market acceptance of Ariba's existing or future products or services; inability to continue to develop competitive new products and services on a timely basis; introduction of new products or services by major competitors; the ability to attract and retain qualified employees; difficulties in assimilating acquired companies; long and unpredictable sales cycles and the deferrals of anticipated orders; declining economic conditions; inability to control costs; changes in the company's pricing or compensation policies; significant fluctuations in our stock price; the outcome of and costs associated with pending or potential future regulatory or legal proceedings; the impact of our acquisitions, including the disruption or loss of customer, business partner, supplier or employee relationships; and the level of costs and expenses incurred by Ariba as a result of such transactions. Factors and risks associated with its business, including a number of the factors and risks described above, are discussed in Ariba's Form 10-K filed December 7, 2005 and in its Form 10-Q filed February 8, 2006.