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*** Exercise Your Right to Vote *** IMPORTANT NOTICE Regarding the Availability of Proxy Materials CELANESE CORPORATION CELANESE CORPORATION 1601 W. LBJ FREEWAY DALLAS, TX 75234 Meeting Information Meeting Type: Annual Meeting For holders as of: February 24, 2010 Date: April 22, 2010 Time: 7:30 a.m. CDT Location: 200 Crescent Court 17th Floor Dallas, TX 75201 You are receiving this communication because you hold shares in the above named company. This is not a ballot. You cannot use this notice to vote 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 mate

 

M20264-P91151 Proxy Materials Available to VIEW or RECEIVE: NOTICE AND PROXY STATEMENT ANNUAL REPORT Before You Vote How to Access the Proxy Materials 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. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before April 8, 2010 to facilitate timely delivery. 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) BY TELEPHONE: 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.rials and voting instructions

 

Voting Items 1a. Mr. David N. Weidman 1b. Mr. Mark C. Rohr 1c. Ms. Farah M. Walters 2. To ratify the selection of KPMG LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2010. 1. To elect the Nominees listed below to serve on our Board of Directors until the 2013 Annual Meeting of Stockholders or until their successors are elected and qualified: Nominees: In their discretion, the Proxyholders are authorized to vote on such other matters as may properly be brought before the meeting in accordance with the provisions of the Company’s Third Amended and Restated By-Laws. M20265-P91151 The Board of Directors recommends a vote FOR all Nominees and FOR proposal 2.