Exhibit 10.2

CDW Corporation

200 N. Milwaukee Avenue

Vernon Hills, Illinois 60061

May 18, 2015

Madison Dearborn Capital Partners V-A, L.P.

Madison Dearborn Capital Partners V-C, L.P.

Madison Dearborn Capital Partners V Executive-A, L.P.

c/o Madison Dearborn Partners, LLC

Three First National Plaza

70 West Madison Street

Suite 4600

Chicago, Illinois 60602

Providence Equity Partners VI L.P.

Providence Equity Partners VI-A L.P.

PEP Co-Investors (CDW) L.P.

c/o Providence Equity Partners L.L.C.

50 Kennedy Plaza

18th Floor

Providence, Rhode Island 02903

Ladies and Gentlemen:

Reference is hereby made to that certain Share Repurchase Agreement, dated as of
May 17, 2015 (the “Repurchase Agreement”), by and among CDW Corporation, a
Delaware corporation (the “Company”), and each of the entities identified on
Schedule 1 thereto (the “Sellers”). Capitalized terms used but not otherwise
defined herein shall have the meanings set forth in the Repurchase Agreement.

The Company and the Sellers hereby mutually agree that the Company shall
repurchase an aggregate of 2,000,000 Common Shares from the Sellers in
accordance with the terms of the Share Repurchase Agreement, which shall be
allocated among the Sellers as set forth on Exhibit A attached hereto.

* * * * * *

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If you agree that this letter sets forth your understanding and agreement with
respect to the matters set forth herein, please execute a copy of this letter in
the space provided below

 

Sincerely,

 

CDW CORPORATION

/s/ Christine A. Leahy

Name: Christine A. Leahy

Title: Senior Vice President, General Counsel and Corporate Secretary

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MADISON DEARBORN CAPITAL PARTNERS V-A, L.P. By: Madison Dearborn Partners V-A&C,
L.P. Its: General Partner By: Madison Dearborn Partners, LLC Its: General
Partner By: /s/ Robin P. Selati Name: Robin P. Selati Its: Managing Director

 

MADISON DEARBORN CAPITAL PARTNERS V-C, L.P.

By: Madison Dearborn Partners V-A&C, L.P. Its: General Partner By: Madison
Dearborn Partners, LLC Its: General Partner By: /s/ Robin P. Selati Name: Robin
P. Selati Its: Managing Director

 

MADISON DEARBORN CAPITAL PARTNERS V EXECUTIVE-A, L.P.

By: Madison Dearborn Partners V-A&C, L.P. Its: General Partner By: Madison
Dearborn Partners, LLC Its: General Partner By: /s/ Robin P. Selati Name: Robin
P. Selati Its: Managing Director

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MDCP CO-INVESTORS (CDW), L.P.

By: Madison Dearborn Partners V-A&C, L.P. Its: General Partner By: Madison
Dearborn Partners, LLC Its: General Partner By: /s/ Robin P. Selati Name: Robin
P. Selati Its: Managing Director

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PROVIDENCE EQUITY PARTNERS VI, L.P. By: Providence Equity GP VI L.P. Its:
General Partner By: Providence Equity Partners VI LLC Its: General Partner By:
/s/ Glenn M. Creamer Name: Glenn M. Creamer Its: Senior Managing Director

 

PROVIDENCE EQUITY PARTNERS VI-A, L.P.

By: Providence Equity GP VI L.P. Its: General Partner By: Providence Equity
Partners VI LLC Its: General Partner By: /s/ Glenn M. Creamer Name: Glenn M.
Creamer Its: Senior Managing Director

 

PEP CO-INVESTORS (CDW), L.P.

By: Providence Equity GP VI L.P. Its: General Partner By: Providence Equity
Partners VI LLC Its: General Partner By: /s/ Glenn M. Creamer Name: Glenn M.
Creamer Its: Senior Managing Director

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Exhibit A

 

SELLER:

NUMBER OF SHARES  

Madison Dearborn Capital Partners V-A, L.P.

  692,904   

Madison Dearborn Capital Partners V-C, L.P.

  183,815   

Madison Dearborn Capital Partners V Executive-A, L.P.

  6,962   

MDCP Co-Investor (CDW), L.P.

  177,805   

Providence Equity Partners VI L.P.

  594,636   

Providence Equity Partners VI-A L.P.

  204,562   

PEP Co-Investors (CDW) L.P.

  139,316