ARIBA, INC. 1999 EQUITY INCENTIVE PLAN NOTICE OFSTOCK OPTION GRANT

The Company may deliver by email all documents relating to the Plan or this option (including, without limitation, prospectuses required by the Securities and Exchange Commission) and all other documents that the Company is required to deliver to its security holders (including, without limitation, annual reports and proxy statements). The Company

may also deliver these documents by posting them on a web site maintained by the Company or by a third party under contract with the Company. The “Ariba, Inc. 1999 Equity Incentive Plan—Summary and Prospectus” is available on the Company’s internal web site at http://web.ariba.com/stock. If, in the future, the Company posts documents required by law on a web site, it will notify you by email.

Regular

Termination

If your Service terminates because of your total and permanent disability, then this option will expire at the close of business at Company headquarters on the first anniversary of your termination date.

For all purposes under this Agreement, “total and permanent disability” means that you are unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental impairment which can be expected to result in death or which has lasted, or can be expected to last, for a continuous period of not less than one year.

Leaves of Absence

and Part-Time

Work

For purposes of this option, your Service does not terminate when you go on a military leave, a sick leave or another bona fide leave of absence, if the leave was approved by the Company in writing and if continued crediting of Service is required by the terms of the leave or by applicable law. But your Service terminates when the approved leave ends, unless you immediately return to active work.

If you go on a leave of absence, then the vesting schedule specified in the Notice of Stock Option Grant may be adjusted in accordance with the Company’s leave of absence policy or the terms of your leave. If you commence working on a part-time basis, then the vesting schedule

Restrictions on

Exercise

When you wish to exercise this option, you must notify the Company in the prescribed manner. Your notice must specify how many shares you wish to purchase. Your notice must also specify how your shares should be registered. The notice will be effective when the Company receives it.

If someone else wants to exercise this option after your death, that person must prove to the Company’s satisfaction that he or she is entitled to do so.

When you submit your notice of exercise, you must also pay the option exercise price for the shares that you are purchasing. Payment may be made in one (or a combination of two or more) of the following forms:

•      Your personal check, a cashier’s check or a money order.

•      Certificates for shares of Company stock that you own, along with any forms needed to effect a transfer of those shares to the Company. The value of the shares, determined as of the effective date of the option exercise, will be applied to the option exercise price. Instead of surrendering shares of Company stock, you may attest to the ownership of those shares on a form provided by the Company and have the same number of shares subtracted from the option shares issued to you. However, you may not surrender, or attest to the ownership of, shares of Company stock in payment of the exercise price if your action would cause the Company to recognize compensation expense (or additional compensation expense) with respect to this option for financial reporting purposes.

•      Irrevocable directions to a securities broker approved by the Company to sell all or part of your option shares and to deliver to the Company from the sale proceeds an amount sufficient to pay the option exercise price and any withholding taxes. (The balance of the sale proceeds, if any, will be delivered to you.) The directions must be given in the manner prescribed by the Company.

•      Irrevocable directions to a securities broker or lender approved by the Company to pledge option shares as security for a loan and to deliver to the Company from the loan proceeds an amount sufficient to pay the option exercise price and any withholding taxes. The directions must be given in the manner prescribed by the Company.

Withholding Taxes

and Stock

Withholding

Restrictions on

Resale

Prior to your death, only you may exercise this option. You cannot transfer or assign this option. For instance, you may not sell this option or use it as security for a loan. If you attempt to do any of these things, this option will immediately become invalid. You may, however, dispose of this option in your will or a beneficiary designation.

Regardless of any marital property settlement agreement, the Company is not obligated to honor a notice of exercise from your former spouse, nor is the Company obligated to recognize your former spouse’s interest in your option in any other way.

The Plan and

Other Agreements

The text of the Plan is incorporated in this Agreement by reference.

The Plan, this Agreement and the Notice of Stock Option Grant constitute the entire understanding between you and the Company regarding this option. Any prior agreements, commitments or negotiations concerning this option are superseded. However, if you and the Company entered into a Severance Agreement, then that Severance Agreement is not superseded and will continue to apply. This Agreement may be amended only by another written agreement between the parties.