Ariba Teams with Avolent to Streamline Invoice Presentment and Payment Through Ariba Supplier Network; Companies Help Buyers and Suppliers Exchange Information More Quickly and Efficiently at a Lower Total Cost.

SUNNYVALE, Calif. -- Ariba(R), Inc. (Nasdaq:ARBA), the leading spend management solutions provider, today announced that it is teaming with Avolent, the leading application software provider for Interactive Self-Service Electronic Billing and Payment, to further streamline the invoice presentment and payment process. Under the terms of a joint marketing agreement, Avolent will develop tools that enable companies using its software to send electronic invoices directly to the Ariba(R) Supplier Network(TM). Buyers using the network can automatically upload invoices and supporting documentation into the Ariba Spend Management solutions they use to process their payables.

"Sending and processing invoices is time consuming and costly, but it doesn't have to be," said Don Darby, Director of Supplier Solutions, Ariba. "Linking Avolent's electronic billing and payment software with the Ariba Supplier Network effectively increases the efficiency and speed of the invoice-to-cash and procure-to-pay cycles and enables suppliers and buyers to reduce their operating costs, enhance their customer service and improve their bottom lines."

Many of the world's leading companies use Ariba(R) Invoice(TM) and the Ariba Supplier Network to optimize their invoicing and reconciliation processes. More than 4 million invoices totaling more than $10 billion were carried across the network in 2005. Likewise, Avolent's software is in place at 3 of the top 5 Internet retailers, and is already used to process more than $50 billion in transactions each year.

"We are pleased to join forces with a leading provider of spend management solutions like Ariba," said Chris Kenney, Avolent's Vice President of Business Development. "By integrating our solutions, we can help suppliers and buyers improve their financial processes, increase their customer service levels, improve control of their cash flow and deliver better operating results."

About Avolent

Avolent is the leading application software provider for Interactive Self-Service Electronic Billing and Payment for organizations that are committed to an eBusiness operating strategy. By implementing Avolent software, organizations can reduce operating costs, increase revenues, optimize cash flow, improve customer satisfaction, and promote compliance. Three of the top five eBusiness companies and two of the three largest PC suppliers in the world have standardized on Avolent. For more information call 800-553-5505 or visit www.avolent.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 650-390-1000 or at www.ariba.com.

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Ariba and the Ariba logo are registered trademarks of Ariba, Inc. Ariba Spend Management, Ariba Spend Management. Find it. Get it. Keep it., Ariba. This is Spend Management, Ariba Solutions Delivery, Ariba Analysis, Ariba Buyer, Ariba Category Management, Ariba Category Procurement, Ariba Contract Compliance, Ariba Contracts, Ariba Contract Management, Ariba Contract Workbench, Ariba Data Enrichment, Ariba eForms, Ariba Sourcing, Ariba Invoice, Ariba Travel & Expense, Ariba Workforce, Ariba Supplier Network, Ariba Supplier Performance Management, Ariba PunchOut, Ariba QuickSource, PO-Flip, Ariba Settlement and Ariba Spend Management Knowledge Base are trademarks or service marks of Ariba, Inc. Ariba Proprietary and Confidential. All rights reserved. Patents pending. All other trademarks are property of their respective owners.

Ariba Safe Harbor 

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.