SCHEDULE 14A
                   Proxy Statement Pursuant to Section 14(a)
           of the Securities Exchange Act of 1934 (Amendment No. __)


Filed by the Registrant                     [ ]

Filed by a Party other than the Registrant  [x]

Check the appropriate box:

[ ]  Preliminary Proxy Statement
[ ]  Confidential, for Use of the Commission Only (as permitted by Rule
     14a-6(e)(2))
[ ]  Definitive Proxy Statement
[ ]  Definitive Additional Materials
[X]  Soliciting Material Pursuant to 240.14a-12

                                Biogen Idec Inc.

                (Name of Registrant as Specified In Its Charter)

                                 CARL C. ICAHN
                            DR. ALEXANDER J. DENNER
                              DR. THOMAS F. DEUEL
                               DR. ERIC ROWINSKY
                            PROFESSOR RICHARD YOUNG
                               ICAHN PARTNERS LP
                         ICAHN PARTNERS MASTER FUND LP
                        ICAHN PARTNERS MASTER FUND II LP
                       ICAHN PARTNERS MASTER FUND III LP
                          ICAHN ENTERPRISES G.P. INC.
                        ICAHN ENTERPRISES HOLDINGS L.P.
                                   IPH GP LLC
                               ICAHN CAPITAL L.P.
                                ICAHN ONSHORE LP
                               ICAHN OFFSHORE LP
                                 BECKTON CORP.
                         HIGH RIVER LIMITED PARTNERSHIP
                             HOPPER INVESTMENTS LLC
                                 BARBERRY CORP.
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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On January 27, 2010, entities affiliated with Mr. Icahn delivered the "Stockholders' Notice of Nomination of Persons for Election as Directors and Other Proposed Business at the 2010 Annual Meeting of Stockholders of Biogen Idec Inc." (the "Notice"). Such Notice states the intention of High River, Icahn Partners, Icahn Master, Icahn Master II and Icahn Master III: (i) to seek to nominate Dr. Eric Rowinsky, Professor Richard Young and Dr. Thomas F. Deuel for election to the Board of Directors of the Issuer at the 2010 annual meeting of stockholders; and (ii) to propose certain amendments to the Issuer's Second Amended and Restated Bylaws that would limit the size of the Board of Directors to thirteen. SECURITY HOLDERS ARE ADVISED TO READ THE PROXY STATEMENT AND OTHER DOCUMENTS RELATED TO THE SOLICITATION OF PROXIES BY CARL C. ICAHN, DR. ALEXANDER J. DENNER, DR. THOMAS F. DEUEL, DR. ERIC ROWINSKY, PROFESSOR RICHARD YOUNG, HIGH RIVER LIMITED PARTNERSHIP, HOPPER INVESTMENTS LLC, BARBERRY CORP., ICAHN PARTNERS LP, ICAHN PARTNERS MASTER FUND LP, ICAHN PARTNERS MASTER FUND II LP, ICAHN PARTNERS MASTER FUND III LP, ICAHN ENTERPRISES G.P. INC., ICAHN ENTERPRISES HOLDINGS L.P., IPH GP LLC, ICAHN CAPITAL L.P., ICAHN ONSHORE LP, ICAHN OFFSHORE LP, BECKTON CORP., AND CERTAIN OF THEIR RESPECTIVE AFFILIATES FROM THE STOCKHOLDERS OF BIOGEN IDEC INC., FOR USE AT ITS ANNUAL MEETING WHEN AND IF THEY BECOME AVAILABLE, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION, INCLUDING INFORMATION RELATING TO THE PARTICIPANTS IN ANY SUCH PROXY SOLICITATION. WHEN AND IF COMPLETED, A DEFINITIVE PROXY STATEMENT AND A FORM OF PROXY WILL BE AVAILABLE TO STOCKHOLDERS OF BIOGEN IDEC INC. FROM THE PARTICIPANTS AT NO CHARGE AND WILL ALSO BE AVAILABLE AT NO CHARGE AT THE SECURITIES AND EXCHANGE COMMISSION'S WEBSITE AT HTTP://WWW.SEC.GOV. INFORMATION RELATING TO THE PARTICIPANTS IN A POTENTIAL PROXY SOLICITATION IS CONTAINED IN EXHIBIT I HERETO.

EXHIBIT I --------- PARTICIPANTS The participants in the potential solicitation of proxies (the "Participants") from stockholders of Biogen Idec Inc. ("Biogen" or the "Corporation") may include the following: Icahn Partners LP, a Delaware limited partnership ("Icahn Partners"), Icahn Partners Master Fund LP, a Cayman Islands limited partnership ("Icahn Master"), Icahn Partners Master Fund II LP, a Cayman Islands limited partnership ("Icahn Master II"), Icahn Partners Master Fund III LP, a Cayman Islands limited partnership ("Icahn Master III"), High River Limited Partnership, a Delaware limited partnership ("High River"), Barberry Corp., a Delaware corporation ("Barberry"), Hopper Investments LLC, a Delaware limited liability company ("Hopper"), Beckton Corp., a Delaware corporation ("Beckton"), Icahn Enterprises G.P. Inc., a Delaware corporation ("Icahn Enterprises GP"), Icahn Enterprises Holdings L.P., a Delaware limited partnership ("Icahn Holdings"), IPH GP LLC, a Delaware limited liability company ("IPH"), Icahn Capital L.P., a Delaware limited partnership ("Icahn Capital"), Icahn Onshore LP, a Delaware limited partnership ("Icahn Onshore"), Icahn Offshore LP, a Delaware limited partnership ("Icahn Offshore"), Mr. Carl C. Icahn, Dr. Alexander J. Denner, Dr. Thomas F. Deuel, Dr. Eric Rowinsky and Professor Richard Young. The address of Icahn Partners, High River, Barberry, Hopper, Beckton, Icahn Enterprises GP, Icahn Holdings, IPH, Icahn Capital, Icahn Onshore and Icahn Offshore is White Plains Plaza, 445 Hamilton Avenue - Suite 1210, White Plains, NY 10601. The address of Icahn Master, Icahn Master II and Icahn Master III is c/o Walkers SPV Limited, P.O. Box 908GT, 87 Mary Street, George Town, Grand Cayman, Cayman Islands. The business address of Mr. Icahn and Dr. Denner is c/o Icahn Associates Corp., 767 Fifth Avenue, 47th Floor, New York, NY 10153. The business address of Dr. Deuel is The Scripps Research Institute, MEM 268, 10550 North Torrey Pines Road, La Jolla, CA 92014. The business address of Dr. Rowinsky is 5 Robin Road, Warren, NJ 07059. The business address for Professor Young is Whitehead Institute for Biomedical Research, Nine Cambridge Center, Cambridge, MA 02142. Icahn Partners, Icahn Master, Icahn Master II, Icahn Master III and High River (collectively, the "Icahn Parties") are entities controlled by Carl C. Icahn. Dr. Denner is an employee and/or officer and director of the Icahn Parties and various other entities controlled by Mr. Icahn who may also participate in soliciting proxies from Biogen stockholders. Dr. Denner does not own beneficially any interest in securities of Biogen, and will not receive any special compensation in connection with such solicitation. In connection with his employment by Mr. Icahn and his affiliated companies, Dr. Denner, among other employees, has a participatory interest in the profits and fees derived by Mr. Icahn and/or his affiliated entities from Icahn Partners, Icahn Master, Icahn Master II and Icahn Master III (collectively, the "Funds"). Because only a portion of such profit interests are distributed and because of their other investments in the Funds, Dr. Denner also has capital accounts in the Funds. In the aggregate: Dr. Denner's profit interests and capital accounts in the Funds entitle him to less than 2% of the profits generated by the Funds. None of Dr. Deuel, Dr. Rowinsky nor Professor Young own beneficially any interest in the securities of Biogen. Each of Dr. Deuel, Dr. Rowinsky and Professor Young have an interest in the election of directors at the Biogen 2010 Annual Meeting of Stockholders pursuant to a Nominee Agreement among each of Dr. Deuel, Dr. Rowinsky and Professor Young, and the Icahn Parties, pursuant to which the Icahn Parties have agreed to pay each of Dr. Deuel, Dr. Rowinsky and Professor Young a fee of $25,000. Barberry is the sole member of Hopper, which is the general partner of High River. Beckton is the sole stockholder of Icahn Enterprises GP, which is the general partner of Icahn Holdings. Icahn Holdings is the sole member of IPH, which is the general partner of Icahn Capital. Icahn Capital is the general partner of each of Icahn Onshore LP and Icahn Offshore. Icahn Onshore is the general partner of Icahn Partners. Icahn Offshore is the general partner of each of Icahn Master, Icahn Master II and Icahn Master III. Each of Barberry and Beckton is 100 percent owned by Carl C. Icahn. As such, Mr. Icahn is in a position indirectly to determine the investment and voting decisions made by each of the Icahn Parties. As of 5:00 p.m. Eastern Standard Time on January 27, 2010, the Icahn Parties are deemed to beneficially own, in the aggregate, 16,075,256 shares of common stock, par value $.0005 per share, issued by Biogen (the "Shares"), representing approximately 5.56% of the Corporation's outstanding Shares (based upon the 289,198,517 Shares stated to be outstanding as of October 14, 2009 by the Corporation in the Corporation's Quarterly Report filed on Form 10-Q with the Securities and Exchange Commission for the quarter ended September 30, 2009.) High River has sole voting power and sole dispositive power with regard to 3,215,051 Shares. Each of Hopper, Barberry and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Partners has sole voting power and sole dispositive power with regard to 4,532,847 Shares. Each of Icahn Onshore, Icahn Capital, IPH, Icahn Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master has sole voting power and sole dispositive power with regard to 5,888,807 Shares. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master II has sole voting power and sole dispositive power with regard to 1,761,077 Shares. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Icahn Master III has sole voting power and sole dispositive power with regard to 677,474 Shares. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn has shared voting power and shared dispositive power with regard to such Shares. Each of Hopper, Barberry and Mr. Icahn, by virtue of their relationships to High River, are deemed to indirectly beneficially own the Shares which High River directly beneficially owns. Each of Icahn Onshore, Icahn Capital, IPH, Icahn Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn, by virtue of their relationships to Icahn Partners, are deemed to indirectly beneficially own the Shares which Icahn Partners directly beneficially owns. Each of Icahn Offshore, Icahn Capital, IPH, Icahn Holdings, Icahn Enterprises GP, Beckton and Mr. Icahn, by virtue of their relationships to Icahn Master, Icahn Master II and Icahn Master III, are deemed to indirectly beneficially own the Shares which Icahn Master, Icahn Master II and Icahn Master III directly beneficially own.