EX-99.A.1.I

Exhibit (a)(1)(I)

INSTRUCTIONS AND OPTION ELECTION FORM
FOR CONDITIONAL EXERCISE OF OPTIONS
in connection with a tender of the underlying shares of common stock, $0.01 par value per share, of

UNITED RENTALS, INC.
pursuant to the Offer to Purchase
dated June 17, 2008, as amended or supplemented from time to time

THE OPTION ELECTION FORM MUST BE RECEIVED BY THE DEPOSITARY BEFORE 2:00 P.M., NEW YORK CITY TIME, ON JULY 11, 2008, UNLESS THE OFFER IS EXTENDED. YOU MUST SIGN AND COMPLETE THIS FORM FOR YOUR DIRECTION TO BE VALID.

Mail or deliver the enclosed Option Election Form or a facsimile to the Depositary for the Offer:


By Mail or Overnight Courier:		By Hand:

American Stock Transfer & Trust Company		American Stock Transfer & Trust Company
Operations Center		Attn: Reorganization Department
Attn: Reorganization Department		59 Maiden Lane
6201 15th Avenue		Concourse Level
Brooklyn, NY 11219		New York, NY 10038

If delivering by facsimile: (718) 234-5001 / Confirmation number: (877) 248-6417
For assistance call: (877) 248-6417 or (718) 921-8317


Name and Address of Option Holder
If there is any error in the name or address shown below,	Options Conditionally Exercised
please make the necessary corrections	(Attach additional signed list if necessary)
			Number of Shares
	Option	Per Share	Issuable Upon
	Grant	Exercise	Conditional
	Date	Price	Exercise
















	Total Shares Tendered:

To holders of vested options to purchase shares under our equity compensation plans or of such options that will vest prior to the Expiration Date:

You should read carefully the Option Election Form, and these instructions, before you complete it. For the Option Election Form to be validly delivered, it must be received by the Depositary at one of the addresses listed above by 2:00 p.m. on July 11, 2008 unless the Offer is extended, in which case the deadline for receipt of the Option Election Form will be 3 business days prior to the date the Offer expires. Delivery of the Option Election Form to another address will not constitute a valid delivery. Deliveries to the Company, the Dealer Managers, the Information Agent or DTC will not be forwarded to the Depositary and will not constitute a valid delivery.

The undersigned acknowledge(s) receipt of the enclosed Offer to Purchase, dated June 17, 2008, and the related Letter of Transmittal in connection with the offer by United Rentals, Inc. (“United Rentals,” the “Company,” “we” or “us”) to purchase up to 27,160,000 shares of its common stock, par value $0.01 per share (the “Common Stock”), including the associated preferred share purchase rights, at a purchase price of not greater than $25.00 nor less than $22.00 per share, net to the seller in cash, less any applicable withholding taxes and without interest, upon the terms and subject to the conditions described in the Offer to Purchase and in the related Letter of Transmittal (which together, as they may be amended or supplemented from time to time, constitute the “Offer”).

You should complete the Option Election Form if you wish to conditionally exercise some or all of your outstanding (as of the Expiration Date of the Offer) and vested options (“Options”) to purchase shares and to tender all the underlying shares (“Option Shares”), pursuant to the terms and conditions set forth in the Offer. We are conducting this Offer through a procedure called a “modified Dutch auction.” If you are willing to sell your shares, this procedure allows you to select the price at which you are willing to sell within a price range specified by us. The price range for the Offer is $22.00 to $25.00 per share. We will select the lowest purchase price (the “Purchase Price”) that will allow us to buy 27,160,000 shares or, if a lesser number of shares is properly tendered, all shares that are properly tendered and not properly withdrawn. We will determine the Purchase Price promptly after the Expiration Date. For purposes of determining the Purchase Price, those shares that are tendered by shareholders agreeing to accept the Purchase Price determined in the Offer will be deemed to be tendered at the minimum price of $22.00.

All shares that we purchase will be purchased at the Purchase Price, even if you have selected a lower price, but we will not purchase any shares above the Purchase Price we determine. If you wish to maximize the chance that your shares will be purchased, you should check the box in the Option Election Form indicating that you will accept the Purchase Price we determine. If you agree to accept the Purchase Price determined in the Offer, you should understand that this election could result in your shares being purchased at the minimum price of $22.00 per share.

By signing the Option Election Form, you agree that if any Option Shares you properly tendered are accepted, you will receive a cash payment equal to (a) the number of Option Shares that are accepted for purchase, multiplied by (b) the difference between the Purchase Price and the applicable Option exercise price(s), less any applicable income, employment and withholding taxes, and you further agree to be bound by the Purchase Price and the terms and conditions set forth herein and in the Offer. You also agree that during the term of the Offer, you will NOT submit any other notice to exercise the Options you have submitted for tender (and we may restrict your ability to do so) until or unless you withdraw your offer to tender.

By signing the Option Election Form, you acknowledge that United Rentals is allowing you to conditionally exercise your Options for the purpose of allowing you to tender Option Shares in the Offer. Further, by signing the Option Election Form, you acknowledge that if United Rentals purchases less than all of your Option Shares, your remaining Options will not be considered to have been exercised and will remain outstanding. If more than 27,160,000 shares (or such greater number of shares as we may elect to purchase, subject to applicable law) are properly tendered and not properly withdrawn then we will purchase shares in the order of priority specified in the Offer to Purchase, which means that Option Shares will be treated as conditionally tendered and we may accept Option Shares for purchase by

random lot, to the extent feasible. Accordingly, under such circumstances, we may not purchase any of the Option Shares you tender even if you tender them at or below the Purchase Price. See Sections 1 and 6 of the Offer to Purchase.

You acknowledge that the order of the Options purchased by United Rentals will be as designated by you in the Option Election Form. In addition, you acknowledge that if you do not designate the order in which you wish to have your Options exercised, your vested Options will be exercised in the order of exercise price starting with the lowest price.

Conditional exercises of Options and tenders of Option Shares pursuant to the Offer may be withdrawn at any time before 2:00 p.m. New York City time, on July 11, 2008 by submitting a written, telegraphic or facsimile transmission notice of withdrawal, including a social security or other taxpayer identification number, so that it is received by the Depositary at the address indicated above. Any such notice of withdrawal must specify the name and social security number of the Option holder who tendered the Option Shares to be withdrawn, the number of Option Shares to be withdrawn and the Grant ID# relating to the Option Shares to be withdrawn. All questions as to the form and validity (including time of receipt) of notices of withdrawal will be determined by United Rentals, in its sole discretion, which determination shall be final and binding. None of United Rentals, the Depository and any other person shall be obligated to give any notice of any defects or irregularities in any notice of withdrawal and none of them shall incur any liability for failure to give any such notice.

The Option Election Form must be received by the Depositary before 2:00 p.m. New York City time, on July 11, 2008. You must sign and complete this form for your direction to be valid.

General Terms and Conditions of the Offer:

Note: By signing the Option Election Form, you also agree to the following terms and conditions which shall not be construed to limit in any way the terms and conditions set forth in the Offer or the Option Election.


	1.	You will, upon request, execute and deliver any additional documents deemed by the Depository or United Rentals to be necessary or desirable to complete the sale, assignment and transfer of the Option Shares tendered hereby and you have read, understand and agree with all of the terms of the Offer.

	2.	You understand that tenders of Option Shares pursuant to the procedures described in the Offer and in the instructions for tender through conditional exercise of options will constitute an agreement between you and United Rentals upon the terms and subject to the conditions of the Offer.

	3.	All authority herein conferred or agreed to be conferred shall survive your death or incapacity and your obligations hereunder shall be binding upon your heirs, personal representatives, successors and assigns. Except as stated herein or in the Offer, this tender is irrevocable.

	4.	United Rentals will pay any stock transfer taxes with respect to the sale and transfer of any Option Shares to it or its order pursuant to the Offer. You understand that (a) the purchase price will be paid to you (you cannot elect to have the purchase price paid to another person); and (b) you will be responsible for paying federal and state income and employment taxes arising from the exercise of the Options and the sale of the Option Shares in the Offer (a portion of which will be withheld as described in Instruction 5).

	5.	Under the U.S. federal income tax laws, United Rentals may be required to withhold income and employment taxes from the amount of any payments made to Option holders pursuant to the Offer. Non-U.S. Option holders will also be subject to 30% (or lower treaty rate) U.S. withholding tax on the total sale price paid to them for the Option Shares pursuant to the Offer. See Section 13 of the Offer.

	6.	All questions as to the number of Option Shares accepted, the form of documents and the validity, eligibility (including time of receipt) and acceptance for payment of any tender of Option Shares will be determined by United Rentals in its sole discretion, which determinations shall be final and binding on all parties. United Rentals reserves the absolute right to reject any or all tenders of Option Shares it


		determines not to be in proper form or the acceptance of which or payment for which may, in the opinion of United Rentals’ counsel, be unlawful. United Rentals also reserves the absolute right to waive any of the conditions of the Offer and any defect or irregularity in the tender of any particular Options Shares, and United Rentals’ interpretation of the terms of the Offer (including these instructions for tender through conditional exercise of options) will be final and binding on all parties. No tender of Option Shares will be deemed to be properly made until all defects and irregularities have been cured or waived. Unless waived, any defects or irregularities in connection with tenders must be cured within such time as United Rentals shall determine. None of United Rentals, the Depository or any other person is or will be obligated to give notice of any defects or irregularities in tenders and none of them will incur any liability for failure to give any such notice.


	7.	If the Option Election Form is signed by a trustee, executor, administrator, guardian, attorney-in-fact, officer of a corporation or other person acting in a fiduciary capacity, such person should also indicate when signing, and proper evidence satisfactory to United Rentals of the authority of such person so to act must be submitted with the Option Election Form.

	8.	Questions and requests for assistance may be directed to D.F. King & Co., Inc., our Information Agent for the Offer, and UBS Investment Bank and Credit Suisse Securities (USA) LLC, our Dealer Managers for the Offer, in each case at the telephone numbers and addresses set forth on the back cover of the Offer to Purchase. You may request additional copies of the Offer to Purchase and other Offer documents, including the Option Election Form from the Information Agent at the telephone number and address on the back cover of the Offer to Purchase.

Note: United Rentals will reject (or not accept) any conditional exercise of, and tender of any
shares underlying, any Option that expires prior to the Expiration Date

To confirm your Option status, please go to www.ubs.com/onesource/uri or call (866) 352-4808.

OPTION ELECTION FORM


1.	Exercise: I hereby conditionally exercise vested options (“Options”), for the amount of shares set forth herein (“Option Shares”), granted to me by United Rentals under one of the Company’s stock Option plans. My exercise of Options hereunder is subject to the condition that any Options for Option Shares tendered but not purchased by United Rentals, shall be deemed not to have been exercised. None of the Options underlying any of the Option Shares tendered has an exercise price of $25.00 or greater or has an expiration date prior to July 16, 2008.

2.	Election: I hereby elect as follows with respect to my Options:

(choose one)


	o	I wish to conditionally exercise and tender Option Shares underlying all of my vested Options.

	o	I wish to conditionally exercise and tender Option Shares underlying my vested Options as listed below.

Options for shares;

Grant Date ;

Per share exercise price of $ ;

Last 10 Digits of Grant ID#

Attach additional page if needed.

Please complete, sign and return a separate Option Election Form for each separate grant of options any of which you wish to conditionally tender.

I acknowledge and agree that if I do not designate the order in which I wish to have my Options exercised, my vested Options will be exercised in the order of exercise price starting with the lowest price. I further acknowledge and agree that if the Purchase Price determined in accordance with the Offer is equal to or lower than the exercise price of an Option, each such Option, and the tendered Option Share with respect to each such Option, shall automatically be deemed not to have been, respectively, exercised or tendered.

Tender Price: By checking one of the following boxes the undersigned hereby tenders those Option Shares specified in Section 2 of this Option Election Form, at the price checked. This action could result in none of the shares being purchased if the Purchase Price determined by the Company is less than the price checked below. The same Option Shares cannot be tendered at more than one price, unless previously withdrawn as provided in Section 4 of the Offer to Purchase. Tenders of Option Shares at a price equal to or less than the exercise price of the underlying Option shall be void.

PRICE (IN DOLLARS) PER OPTION SHARE AT WHICH SHARES ARE BEING TENDERED
CHECK ONLY ONE BOX
IF MORE THAN ONE BOX IS CHECKED OR IF NO BOX IS CHECKED,
THERE IS NO PROPER TENDER OF SHARES


o Price $22.00	o Price $23.25	o Price $24.50
o Price $22.25	o Price $23.50	o Price $24.75
o Price $22.50	o Price $23.75	o Price $25.00
o Price $22.75	o Price $24.00
o Price $23.00	o Price $24.25

By checking the box below INSTEAD OF ONE OF THE BOXES ABOVE the undersigned hereby tenders those Option Shares specified in Section 2 of this Option Election Form at the purchase price determined by the Company in accordance with the terms of the Offer.


	o	The undersigned wants to maximize the chance of having the Company purchase all Option Shares the undersigned is tendering. Accordingly, by checking this box instead of one of the price boxes above, the undersigned hereby tenders Option Shares at, and is willing to accept, the purchase price determined by the Company in accordance with the terms of the Offer.

The undersigned understands that this election could result in the tendered shares being purchased at the minimum price of $22.00 per share. The undersigned acknowledges and agrees that should the Purchase Price per Option Share determined by the Company in accordance with the terms of the Offer be equal to or less than the exercise price of the underlying Option, this tender shall be void.

Agreement: The undersigned acknowledges receipt of the Offer the instructions to this Option Election Form and related materials and represents that the undersigned has read carefully such documents. The undersigned hereby instructs United Rentals, subject to the terms and conditions set forth in this Option Election Form, and in the Offer, to carry out the instructions contained in this form. United Rentals is hereby authorized, in accordance with the instructions contained in this Option Election Form, to (i) exercise the undersigned’s Options (but only to the extent that the related Option Shares are accepted for purchase pursuant to the Offer) and deliver such Option Shares to American Stock Transfer & Trust Company as Depositary for the Offer; (ii) retain from the net cash proceeds received pursuant to the Offer from the purchase of the Option Shares the Option exercise price for such Option Shares and related withholding, employment and income taxes; and (iii) remit to the undersigned the remaining net cash proceeds. The undersigned agrees that, if the net cash proceeds from the purchase of the undersigned’s Option Shares is insufficient to cover the related Option exercise price and to pay applicable withholding taxes, the undersigned will, immediately upon request of United Rentals, forward to United Rentals a check in an amount sufficient to cover any such shortfall. The method of delivery of this document is at the election and risk of the undersigned.


Signature:


Print Name:


Address:


Area Code and Telephone Number:


Social Security Number:


Date: