Exhibit 99.1

Ariba Reports Results for Fourth Quarter and Fiscal Year 2007

Record Subscription Software Bookings Drive 53% Year-over-Year Increase in

Subscription Software Backlog

SUNNYVALE, Calif., October 25, 2007 — Ariba, Inc. (Nasdaq: ARBA), the leading spend management solutions provider, today announced results for the fourth quarter and fiscal year 2007 ended September 30, 2007.

Quarterly Financial and Operational Highlights

“Ariba delivered another solid quarter to end a fiscal year in which we successfully transitioned to an on-demand business model,” said Bob Calderoni, Chairman and CEO, Ariba. “As evidenced by our results, we continue to execute well against our strategy to be the leading on-demand provider of spend management solutions. We have a backlog of subscription software revenues of $130 million, which is up 53% year-over-year, and on the revenue side, our subscriptions software revenues grew 27% year-over-year to $19 million,” Calderoni continued. “With our recent announcement of a definitive agreement to acquire Procuri Inc., we look forward to starting a new fiscal year as one of the fastest growing on-demand solutions providers, and extending our leadership by accelerating our penetration in the fastest growing segment of this market – the mid-market.”

Results for the Fourth Quarter of Fiscal Year 2007

Revenue: Total revenues for the fourth quarter of fiscal year 2007 were $75.5 million, as compared to $72.4 million for the fourth quarter of fiscal year 2006. Subscription and maintenance revenues for the quarter were $37.5 million, as compared to $33.4 million for the fourth quarter of fiscal year 2006. Within subscription and maintenance revenues, subscription software revenue was $18.8 million for the quarter, as compared to $14.7 million for the fourth quarter of fiscal year 2006. Services and other revenues for the quarter were $38.1 million, as compared to $39.1 million for the fourth quarter of fiscal year 2006.

Earnings Per Share: Net loss for the fourth quarter of fiscal year 2007 was $3.8 million, or $0.05 per share, as compared to a net loss for the fourth quarter of fiscal year 2006 of $10.1 million, or $0.15 per share. The net loss for the fourth quarter of fiscal year 2007 included charges of $3.4 million for amortization of intangible assets and $6.2 million for stock-based compensation and a $0.4 million benefit in the restructuring cost line. Excluding these items, non-GAAP net income was $5.4 million, or $0.07 per diluted share.

Cash: Cash flow from operations for the fourth quarter of fiscal year 2007 was approximately $7 million, as compared to approximately $4 million for the fourth quarter of fiscal year 2006. At September 30, 2007 total cash, cash equivalents, marketable securities, and investments were approximately $183 million.

Results for Fiscal Year 2007

Revenue: Total revenues for fiscal year 2007 were $301.7 million, as compared to $296.0 million for the fiscal year 2006. Subscription and maintenance revenues were $142.3 million, as compared to $130.1 million for fiscal year 2006. Services and other revenues were $159.4 million, as compared to $166.0 million for the fiscal year 2006.

Earnings Per Share: Net loss for fiscal year 2007 was $15.0 million, or $0.21 per share, as compared to a net loss for fiscal year 2006 of $47.8 million, or $0.73 per share. The net loss for fiscal year 2007 included charges of $14.6 million for amortization of intangible assets and $32.4 million for stock-based compensation and a $4.2 million benefit in the restructuring cost line. Excluding these items, non-GAAP net income was $27.9 million, or $0.37 per diluted share.

Cash: Cash flow from operations for the fiscal year 2007 was approximately $17 million, as compared to approximately $23 million for the fiscal year 2006.

Continued Global Growth

More than 600 companies worldwide leverage Ariba’s technology, expertise and services to control costs, minimize risk, improve profits and drive competitive advantage. During the fourth quarter, Ariba continued to accelerate its global growth. 200 companies of all sizes across geographies purchased Ariba solutions to drive their spend management strategies, including: AstraZeneca PLC, JLG Industries, Inc., Pfizer, Inc., Schering-Plough Corporation, Commonwealth Bank of Australia, Nestle SA, RTE, Tyco Electronics Corporation, Telefonica S.A., Nippon Life Insurance Company, AXA, Jindal Stainless, and Air Products and Chemicals, Inc.

“So many sourcing organizations spend the majority of their time obtaining data,” said Kenneth R. Naughton, Manager of Strategic Sourcing & Supplier Excellence, Cornell University, Division of Financial Affairs. “With Ariba, our staff can spend their time acting on aggregated spending data, perform additional analysis, build stronger relationships with our customers and proactively develop holistic category strategies. Ariba provides an exceptional spend management offering that is the foundation of our enterprise strategic sourcing strategy and our overall success.”

Expanding On-Demand Footprint

On September 20, Ariba announced a definitive agreement to acquire Procuri Inc., a leading provider of on-demand supply management solutions. With more than 300 customers including Barclays Bank PLC, The Boots Company PLC, ConAgra Foods, Domino’s Pizza, PMC, Inc., Hess Corporation, JetBlue Airways, Novation LLC, Sun Microsystems, UPM-Kymmene, and United Parcel Service of America, Inc. (UPS), Procuri has extensive experience in delivering on-demand solutions to companies across a range of industries and geographies.

“The acquisition of Procuri not only supports our strategy to accelerate our growth in the mid-market, but also broadens our on-demand footprint,” said Jim Frankola, Chief

Financial Officer, Ariba. “Once integrated, the transaction should add scale and leverage to Ariba’s financial model, allowing us to grow faster, expand margins and increase earnings per share more quickly than we would have on a stand-alone basis.”

The transaction, which is subject to customary closing conditions and regulatory approvals, is expected to close in the first quarter of Ariba’s fiscal year 2008, ending December 31, 2007.

Conference Call Information

Ariba will hold a conference call today at 2:00 p.m. PT / 5:00 p.m. ET to discuss its results for the fourth quarter of fiscal year 2007. To join the call, please dial (877) 407-8033 in the United States and Canada or (201) 689-8033 internationally. A live web broadcast of the call will be available on the investor relations section of Ariba’s website at: www.ariba.com. The webcast may also be accessed by logging in at www.vcall.com.

A replay of the conference call will be available from approximately 5:00 p.m. PT / 8:00 p.m. ET today through Thursday, November 1, 2007 by calling (877) 660-6853 in the United States and Canada or (201) 612-7415 internationally and entering account number: 286 and conference ID number: 258105.

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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Copyright ^© 1996 – 2007 Ariba, Inc.

Ariba, the Ariba logo, AribaLIVE and SupplyWatch 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 Electronic Invoice Presentment and Payment, Ariba Invoice, Ariba Sourcing, Ariba Spend Visibility, Ariba Travel and Expense, Ariba Procure-to-Pay, Ariba Workforce, Ariba Supplier Network, Ariba Supplier Connectivity, Ariba Supplier Performance Management, Ariba PunchOut, Ariba QuickSource, PO-Flip, Ariba Settlement, Ariba Spend Management Knowledge Base, Ariba Ready, Ariba Supply Lines, Ariba Supply Manager, Ariba LIVE and It’s Time for Spend Management 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-Q filed August 8, 2007.

Non-GAAP Financial Measures

In addition to disclosing financial measures prepared in accordance with Generally Accepted Accounting Principles (GAAP), this press release and the accompanying tables contain non-GAAP financial measures. For a description of these non-GAAP financial measures, including the reasons why management uses each measure, and reconciliations of these non-GAAP financial measures to the most directly comparable GAAP financial measures, please see the section of the accompanying tables titled “Non-GAAP Financial Measures” as well as the related tables that follow it. We anticipate disclosing forward-looking non-GAAP financial information in our conference call to discuss our fiscal 2007 fourth quarter and full-year results. Some of this forward-looking non-GAAP financial information, including an estimate of non-GAAP earnings for fiscal 2008, excludes certain expenses that we cannot readily estimate without unreasonable effort.

Investor Contact:

Elaine Kitagawa

Ariba, Inc.

(650) 390-1200

Investor@ariba.com

Media Contact:

Karen Master

Ariba, Inc.

(412) 297-8177

kmaster@ariba.com

Ariba, Inc. and Subsidiaries

Condensed Consolidated Balance Sheets

(Unaudited; in thousands)

Ariba, Inc. and Subsidiaries

Condensed Consolidated Statements of Operations

(Unaudited; in thousands, except per share data)

Ariba, Inc. and Subsidiaries

Cash Flows

(Unaudited; in thousands)

Non-GAAP Financial Measures

The accompanying press release dated October 25, 2007 contains non-GAAP financial measures. The following table reconciles the non-GAAP financial measures in the press release to the most directly comparable financial measures prepared in accordance with Generally Accepted Accounting Principles (GAAP). These non-GAAP measures include non-GAAP cost of revenues, gross profit, operating expenses, (loss) income from operations, net (loss) income and net (loss) income per share amounts.

Non-GAAP financial measures should not be considered as a substitute for, or superior to, GAAP financial measures, which should be considered as the primarily financial metrics for evaluating our financial performance. Significantly, non-GAAP financial measures are not based on a comprehensive set of accounting rules or principles. Instead, they are based on subjective determinations by management designed to supplement our GAAP financial measures. They are subject to a number of important limitations and should be considered only in conjunction with our consolidated financial statements prepared in accordance with GAAP. For example, our non-GAAP financial measures have the effect of excluding costs and expenses from our operating results that should be properly considered under a system of accrual accounting. In addition, our non-GAAP financial measures differ from GAAP measures with the same names, may vary over time and may differ from non-GAAP financial measures with the same or similar names used by other companies. Accordingly, investors should exercise caution when evaluating our non-GAAP financial measures.

Despite these limitations, we believe our non-GAAP financial measures provide meaningful supplemental information about our operating results, primarily because they exclude costs and expenses that we do not believe are indicative of the ongoing operating performance of our business and our senior management. Although these costs should properly be considered in our GAAP financial measures, we believe they should be excluded when evaluating our current operating performance. The non-GAAP financial measures disclosed in the accompanying press release are used by our Board of Directors and senior management to evaluate our current operating performance, are used in evaluating the performance of our senior management, and are used in our budget and planning processes. We believe that our non-GAAP financial measures are helpful to investors by facilitating comparisons of our current and prior operating results and by facilitating comparisons of our operating results with those of other software companies.

Ariba, Inc. and Subsidiaries

Reconciliation of GAAP to Non-GAAP Operating Results

(Unaudited; in thousands, except per share data)

The following tables reconcile the specific items excluded from GAAP in the calculation of non-GAAP operating results for the period indicated below:

See “Discussion of Specific Items Excluded From Non-GAAP Financial Measures” at the end of the reconciliation of GAAP to non-GAAP operating results.

Ariba, Inc. and Subsidiaries

Reconciliation of GAAP to Non-GAAP Operating Results

(Unaudited; in thousands, except per share data)

The following tables reconcile the specific items excluded from GAAP in the calculation of non-GAAP operating results for the period indicated below:

See “Discussion of Specific Items Excluded From Non-GAAP Financial Measures” at the end of the reconciliation of GAAP to non-GAAP operating results.

Discussion of Specific Items Excluded From Non-GAAP Financial Measures

Our non-GAAP financial measures generally exclude costs and expenses for (i) amortization of intangible assets related to acquisitions, (ii) stock-based compensation and (iii) restructuring. We exclude these costs and expenses because we believe they are not closely related to the ongoing operating performance of our businesses and the performance of our senior management and are generally excluded from our budget and planning process. In addition to these reasons, we believe our non-GAAP financial measures are also helpful to investors by facilitating comparisons of our operating results over different time periods and by facilitating comparisons of our financial performance with that of other companies. In addition, except for restructuring, these costs and expenses are non-cash items that do not affect cash flows.