Exhibit 24

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ Andrew N. Baur                                        

Andrew N. Baur

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 22nd day of December, 2006.

/s/ Andrew N. Baur                                        

Andrew N. Baur

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ John W. Daniels, Jr.                                  

John W. Daniels, Jr.

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 22nd day of December, 2006.

/s/ John W. Daniels, Jr.                                  

John W. Daniels, Jr.

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ Bruce E. Jacobs                                         

Bruce E. Jacobs

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 22nd day of December, 2006.

/s/ Bruce E. Jacobs                                         

Bruce E. Jacobs

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ Ted D. Kellner                                           

Ted D. Kellner

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 21st day of December, 2006.

/s/ Ted D. Kellner                                           

Ted D. Kellner

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ Dennis J. Kuester                                     

Dennis J. Kuester

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 7th day of December, 2006.

/s/ Dennis J. Kuester                                      

Dennis J. Kuester

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ John A. Mellowes                                      

John A. Mellowes

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 22nd day of December, 2006.

/s/ John A. Mellowes                                      

John A. Mellowes

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ Edward L. Meyer, Jr.                                 

Edward L. Meyer, Jr.

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 21st day of December, 2006.

/s/ Edward L. Meyer, Jr.                                 

Edward L. Meyer, Jr.

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ San W. Orr, Jr.                                           

San W. Orr, Jr.

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 21st day of December, 2006.

/s/ San W. Orr, Jr.                                           

San W. Orr, Jr.

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ Robert J. O’Toole                                      

Robert J. O’Toole

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 22nd day of December, 2006.

/s/ Robert J. O’Toole                                      

Robert J. O’Toole

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ Peter M. Platten, III                                   

Peter M. Platten, III

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 22nd day of December, 2006.

/s/ Peter M. Platten, III                                   

Peter M. Platten, III

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as her true and lawful attorney-in-fact for the purpose of:  (i) executing in her name and on her behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in her name and on her behalf in her capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming her signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 28th day of February, 2006.

/s/ Debra S. Waller                                         

Debra S. Waller

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as her true and lawful attorney-in-fact for the purpose of:  (i) executing in her name and on her behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in her name and on her behalf in her capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming her signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 22nd day of December, 2006.

/s/ Debra S. Waller                                         

Debra S. Waller

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ George E. Wardeberg                                

George E. Wardeberg

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 22nd day of December, 2006.

/s/ George E. Wardeberg                                

George E. Wardeberg

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the 2006 Equity Incentive Plan)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong, John M. Presley and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the 2006 Equity Incentive Plan and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 16th day of February, 2006.

/s/ James B. Wigdale                                      

James B. Wigdale

DIRECTOR’S POWER OF ATTORNEY

(Form S-8 for the United Heritage Bankshares of Florida, Inc. Option Plans)

The undersigned director of Marshall & Ilsley Corporation designates each of Mark F. Furlong and Randall J. Erickson, with the power of substitution, as his true and lawful attorney-in-fact for the purpose of:  (i) executing in his name and on his behalf Marshall & Ilsley Corporation’s Registration Statement on Form S-8 relating to the United Heritage Bankshares of Florida, Inc. Option Plans and any related amendments (including post-effective amendments) and/or supplements to said Form S-8; (ii) generally doing all things in his name and on his behalf in his capacity as a director to enable Marshall & Ilsley Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, the Securities Act of 1933, as amended, and all requirements of the Securities and Exchange Commission; and (iii) ratifying and confirming his signature as it may be signed by the attorney-in-fact to the Form S-8 and any related amendments (including post-effective amendments) and/or supplements thereto.

Dated this 21st day of December, 2006.

/s/ James B. Wigdale                                      

James B. Wigdale