Exhibit (a)(1)(iii)
    NOTICE OF GUARANTEED DELIVERY
    FOR
 
    LIBERTY MEDIA
    CORPORATION
 
    OFFER TO PURCHASE FOR CASH
    UP TO 19,417,476 SHARES OF ITS
    LIBERTY INTERACTIVE SERIES A COMMON STOCK,
    AT A PURCHASE PRICE NOT GREATER THAN $25.75
    OR LESS THAN $23.75 PER SHARE
 
    As set forth in Section 3 of the offer to purchase dated
    May 15, 2007, of Liberty Media Corporation (the Offer
    to Purchase), this notice of guaranteed delivery, or a
    facsimile hereof, must be used to accept the tender offer if:
 
    (a) certificates representing shares of Liberty Interactive
    Series A common stock, par value $0.01 per share, of
    Liberty Media Corporation, a Delaware corporation, cannot be
    delivered prior to the expiration date (as defined
    in Section 1 of the Offer to Purchase); or
 
    (b) the procedure for book-entry transfer cannot be
    completed before the expiration date; or
 
    (c) time will not permit a properly completed and duly
    executed letter of transmittal, or manually signed facsimile
    thereof, and all other required documents to reach the
    depositary referred to below before the expiration date.
 
    This form or a facsimile of it, signed and properly completed,
    may be delivered by hand or transmitted by facsimile
    transmission or mailed to the Depositary so that it is received
    by the Depositary before the expiration date. See Section 3
    of the Offer to Purchase.
 
    The Depositary for the Offer is:
 
    COMPUTERSHARE SHAREHOLDER
    SERVICES, INC.
 
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    By Mail:
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    By Overnight
    Delivery:
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    Computershare Shareholder
    Services, Inc.
    
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    Computershare Shareholder
    Services, Inc.
    
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    Attn: Corporate Actions
    
 
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    Attn: Corporate Actions
    
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    P.O. Box 859208
    
 
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    161 Bay State Drive
    
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    Braintree MA
    02185-9208
    
 
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    Braintree MA 02184
    
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    By Facsimile Transmission (For Eligible Institutions
    Only):
    Facsimile Transmission:
    781-930-4942
 
    To Confirm Facsimile Transmissions (For Eligible Institutions
    Only):
    Confirm Receipt of Facsimile
    By Telephone:
    781-930-4900
 
    DELIVERY OF THIS NOTICE OF GUARANTEED DELIVERY TO AN ADDRESS
    OTHER THAN THOSE SHOWN ABOVE OR TRANSMISSION OF
    INSTRUCTIONS VIA A FACSIMILE NUMBER OTHER THAN THE ONE
    LISTED ABOVE DOES NOT CONSTITUTE A VALID DELIVERY. DELIVERIES TO
    LIBERTY MEDIA CORPORATION OR THE INFORMATION AGENT FOR THE
    TENDER OFFER WILL NOT BE FORWARDED TO THE DEPOSITARY AND
    THEREFORE WILL NOT CONSTITUTE VALID DELIVERY. DELIVERIES TO THE
    BOOK-ENTRY TRANSFER FACILITY (AS DEFINED IN THE OFFER TO
    PURCHASE) WILL NOT CONSTITUTE VALID DELIVERY TO THE DEPOSITARY.
 
    This notice of guaranteed delivery form is not to be used to
    guarantee signatures. If a signature on the letter of
    transmittal is required to be guaranteed by an eligible
    guarantor institution (as defined in Section 3 of the
    Offer to Purchase) under the instructions thereto, such
    signature must appear in the applicable space provided in the
    signature box on the letter of transmittal.
 
 
    Ladies and Gentlemen:
 
    The undersigned hereby tenders to Liberty Media Corporation the
    number of shares of Liberty Interactive Series A common
    stock indicated below at a price per share not greater than
    $25.75 or less than $23.75, net to the seller in cash, less any
    applicable withholding taxes, without interest, upon the terms
    and subject to the conditions set forth in the Offer to Purchase
    and the related letter of transmittal which as may be amended
    and supplemented from time to time together constitute the
    tender offer, receipt of which are hereby acknowledged.
 
 
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    |     Number of shares of Liberty
    Interactive Series A common stock:  | 
    
    
    
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    |     Certificate No(s). (if
    available):  | 
    
    
    
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    (Please Type or Print)
    
 
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    |     Address(es) including Zip
    Code:  | 
    
    
    
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    |     Area Code and Telephone
    Number(s):  | 
    
    
    
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    Dated:           ,
    2007
 
    If shares of Liberty Interactive Series A common stock will
    be tendered by book-entry transfer, provide the following
    information:
 
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    |     Account Number at Book-Entry
    Transfer Facility:  | 
    
    
    
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    2
 
 
    CHECK
    EXACTLY ONE BOX ON THIS PAGE. IF YOU CHECK MORE THAN ONE BOX, OR
    IF YOU DO NOT CHECK ANY BOX, YOU WILL HAVE FAILED TO VALIDLY
    TENDER ANY SHARES
 
    SHARES TENDERED AT PRICE DETERMINED PURSUANT TO THE
    TENDER OFFER
    (See Instruction 6 of the Letter of Transmittal)
 
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    The undersigned wants to maximize the chance of having Liberty
    Media purchase all Shares the undersigned is tendering (subject
    to the possibility of proration). Accordingly, by checking this
    one box instead of one of the price boxes below,
    the undersigned hereby tenders Shares and is willing to accept
    the purchase price determined by Liberty Media pursuant to the
    Tender Offer. If you agree to accept the purchase price
    determined by Liberty, your Shares will be deemed to be tendered
    at the minimum price of $23.75 per share. You should
    understand that this election may lower the purchase price paid
    for all purchased Shares in the Tender Offer and could result in
    your Shares being purchased at the minimum price of $23.75 per
    share.
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    OR
    SHARES TENDERED AT PRICE DETERMINED BY STOCKHOLDER
    (See Instruction 6 of the Letter of Transmittal)
 
    By checking one of the boxes below instead of the box
    above, the undersigned hereby tenders Shares at the price
    checked. This action could result in none of the Shares being
    purchased if the purchase price for the Shares is less than the
    price checked below. A stockholder who desires to tender
    Shares at more than one price must complete a separate letter of
    transmittal for each price at which the stockholder tenders such
    shares. You cannot tender the same Shares at more than one
    price, unless you have previously validly withdrawn those shares
    tendered at a different price in accordance with Section 4
    of the Offer to Purchase.
 
    Price (in dollars) per Share at which Shares
    are being tendered:
 
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    o $23.75
    
 
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    o $25.05
    
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    o $23.85
    
 
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    o $25.15
    
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    o $23.95
    
 
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    o $25.25
    
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    o $24.05
    
 
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    o $25.35
    
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    o $24.15
    
 
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    o $25.45
    
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    o $24.25
    
 
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    o $25.55
    
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    o $24.35
    
 
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    o $25.65
    
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    o $24.45
    
 
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    o $25.75
    
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    o $24.55
    
 
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    o $24.65
    
 
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    o $24.75
    
 
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    o $24.85
    
 
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    o $24.95
    
 
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    You will not have validly tendered your Shares unless you
    check one and only one box in this frame.
    
    3
 
    CONDITIONAL
    TENDER
    (See Instruction 7 of the Letter of Transmittal)
 
    A tendering stockholder may condition his or her tender of
    Shares upon Liberty Media purchasing a specified minimum number
    of the Shares tendered by the tendering stockholder, all as
    described in Section 6 of the Offer to Purchase
    Conditional Tender of Shares. Unless at least that
    minimum number of Shares indicated below is purchased by Liberty
    Media from the tendering stockholder pursuant to the terms of
    the Tender Offer, none of the Shares tendered by the tendering
    stockholder will be purchased. It is the tendering
    stockholders responsibility to calculate that minimum
    number of Shares that must be purchased from the tendering
    stockholder if any are purchased, and each stockholder is urged
    to consult his or her own tax advisor. Unless this box has been
    checked and a minimum specified, the tender will be deemed
    unconditional.
 
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    The minimum number of Shares that must be purchased from the
    tendering stockholder, if any are purchased,
    is:           shares.
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    If, because of proration, the minimum number of Shares
    designated will not be purchased, Liberty Media may accept
    conditional tenders by random lot, if necessary. However, to be
    eligible for purchase by random lot, the tendering stockholder
    must have tendered all of his or her Shares and, if true,
    checked the following box:
 
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    The tendered Shares represent all Shares held by the undersigned.
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    ODD
    LOTS
    (See Instruction 11 of the Letter of Transmittal)
 
    To be completed only if the Shares are being tendered by or on
    behalf of a person owning beneficially or of record an aggregate
    of fewer than 100 Shares. The undersigned either (check
    one box):
 
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    is the beneficial or record owner of an aggregate of fewer than
    100 Shares, all of which are being tendered; or
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    is a broker, dealer, commercial bank, trust company or other
    nominee that (a) is tendering for the beneficial owner(s)
    thereof, shares with respect to which it is record holder and
    (b) believes, based upon representations made to it by such
    beneficial owner(s), that each such person is the beneficial or
    record owner of an aggregate of fewer than 100 Shares and
    is tendering all of such shares.
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    In addition, the undersigned is tendering Shares either
    (check one box):
 
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    at the price determined by Liberty Media pursuant to the Tender
    Offer (persons checking this box need not indicate the price per
    share above); or
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    at the price per share indicated above under
    Shares Tendered At Price Determined By
    Stockholder.
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    4
 
    GUARANTEE
    (NOT
    TO BE USED FOR SIGNATURE GUARANTEE)
    
 
    THE UNDERSIGNED, A BANK, BROKER, DEALER, CREDIT UNION, SAVINGS
    ASSOCIATION OR OTHER ENTITY WHICH IS A MEMBER IN GOOD STANDING
    OF THE SECURITIES TRANSFER AGENTS MEDALLION PROGRAM OR AN
    ELIGIBLE GUARANTOR INSTITUTION, AS SUCH TERM IS
    DEFINED IN
    RULE 17Ad-15
    UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED, EACH OF
    THE FOREGOING CONSTITUTING AN ELIGIBLE GUARANTOR
    INSTITUTION, GUARANTEES THE DELIVERY TO THE DEPOSITARY OF
    THE SHARES TENDERED HEREBY, IN PROPER FORM FOR
    TRANSFER, OR A CONFIRMATION THAT THE SHARES TENDERED HEREBY
    HAVE BEEN DELIVERED UNDER THE PROCEDURE FOR BOOK-ENTRY TRANSFER
    SET FORTH IN THE OFFER TO PURCHASE INTO THE DEPOSITARYS
    ACCOUNT AT THE BOOK-ENTRY TRANSFER FACILITY, TOGETHER WITH A
    PROPERLY COMPLETED AND DULY EXECUTED LETTER OF TRANSMITTAL, OR A
    MANUALLY SIGNED FACSIMILE THEREOF, AND ANY OTHER REQUIRED
    DOCUMENTS, ALL WITHIN THREE NASDAQ GLOBAL SELECT MARKET TRADING
    DAYS OF THE DATE HEREOF.
 
 
    AUTHORIZED SIGNATURE
 
    (Please Type or Print)
    
 
 
    Zip Code
 
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    |     Area Code and Telephone
    Number:  | 
    
    
    
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    Dated:           ,
    2007
 
    DO NOT SEND SHARE CERTIFICATES WITH THIS NOTICE OF GUARANTEED
    DELIVERY. SHARE CERTIFICATES SHOULD BE SENT WITH YOUR LETTER OF
    TRANSMITTAL.
 
    
    5