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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
SCHEDULE 14A
(RULE 14a-101)
SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the Securities
Exchange Act of 1934 (Amendment No.      )
Filed by the Registrant þ
Filed by a Party other than the Registrant o
Check the appropriate box:
     
o   Preliminary Proxy Statement
o   Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
o   Definitive Proxy Statement
þ   Definitive Additional Materials
o   Soliciting Material Pursuant to Section 240.14a-12
WESCO INTERNATIONAL, INC.
 
(Name of Registrant as Specified In Its Charter)
 
(Name of Person(s) Filing Proxy Statement)
Payment of Filing Fee (Check the appropriate box):
þ No fee required.
 
o Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.
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o Fee paid previously with preliminary materials.
 
o Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.
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*** Exercise Your Right to Vote ***
Important Notice Regarding the Availability of Proxy Materials for the
Shareholder Meeting to Be Held on May 25, 2011.

WESCO INTERNATIONAL, INC.
Meeting Information
Meeting Type:          Annual Meeting
For holders as of:   March 30, 2011
Date: May 25, 2011    Time: 2:00 PM EDT
Location:   Hyatt Regency
Pittsburgh Int. Airport
1111 Airport Boulevard
Pittsburgh, PA 15231
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 materials and voting instructions.


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—  Before You Vote  —
How to Access the Proxy Materials
      

Proxy Materials Available to VIEW or RECEIVE:
NOTICE AND PROXY STATEMENT        ANNUAL REPORT
How to View Online:
Have the information that is printed in the box marked by the arrow è  XXXX XXXX XXXX  (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 information that is printed in the box marked by the arrow è  XXXX XXXX XXXX  (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. Please make the request as instructed above on or before May 11, 2011 to facilitate timely delivery.


—  How To Vote  —
Please Choose One of the Following Voting Methods
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Vote In Person: If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. 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.
Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow è  XXXX XXXX XXXX  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 voting instruction form.


 

 

     
Voting Items
   
   
The Board of Directors recommends you vote
FOR the following:
1.   Election of Directors for a Term expiring in 2014
 
    Nominees
01)      George L. Miles Jr.
02)      John K. Morgan
03)      James L. Singleton
The Board of Directors recommends you vote FOR the following proposal:
 
2.   Advisory Vote on Executive Compensation.
 
The Board of Directors recommends you vote 1 year on the following proposal:
 
3.   To recommend, by non-binding vote, the frequency of advisory votes on executive compensation.
 
The Board of Directors recommends you vote FOR the following proposal:
 
4.   Ratify the appointment of PricewaterhouseCoopers LLP as our independent registered public accounting firm for the year ending December 31, 2011.
 
NOTE: In their discretion, the proxies are authorized to vote upon such other business as may properly come before the meeting or any adjournment or postponement thereof.
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Voting Instructions
   
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