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*** Exercise Your Right to Vote *** IMPORTANT NOTICE Regarding the Availability of Proxy Materials Meeting Information CELANESE CORPORATION Meeting Type: Annual For holders as of: 03/02/09 Date: 04/23/09 Time: 7:30 a.m., CDT Location: The Crescent Club 200 Crescent Court — 17th Floor Dallas, Texas 75201 You are receiving this communication because you hold shares in the company named above. CELANESE CORPORATION This is not a ballot. You cannot use this notice to vote 1601 W. LBJ FREEWAY DALLAS, TX 75234 these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. See the reverse side of this notice to obtain proxy materials and voting instructions.

 

How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: NOTICE AND PROXY STATEMENT            FORM 10-K            CHAIRMAN’S LETTER How to View Online: Have the 12-Digit Control Number available (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BYTELEPHONE: 1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the 12-Digit Control Number (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. To facilitate timely delivery, please make the request as instructed above on or before 04/09/09. How To Vote Please Choose One of the Following Voting Methods Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the 12-Digit Control Number available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

 

Voting Items The Board of Directors’ recommends a vote FOR all Nominees and FOR proposals 2, 3 and 4. 1. To elect the Nominees listed below to serve on our Board of Directors until the 2012 Annual Meeting of Stockholders or until their successors are elected and qualified; Nominees: 1a. Mr. James E. Barlett 1b. Mr. David F. Hoffmeister 1c. Mr. Paul H. O’Neill 2. To ratify the selection of KPMG LLP (“KPMG”) as our independent registered public accounting firm for the fiscal year ending December 31, 2009; 3. To consider and vote on a proposal to approve the 2009 Global Incentive Plan; and 4. To consider and vote on a proposal to approve the 2009 Employee Stock Purchase Plan.