Marshall & Ilsley Corporation Completes Acquisition of United Heritage Bankshares of Florida, Inc.

MILWAUKEE, April 2, 2007 /PRNewswire-FirstCall via COMTEX News Network/ — Marshall & Ilsley Corporation (NYSE: MI) (M&I) announced today the completion of its acquisition of United Heritage Bankshares of Florida, Inc. (United Heritage). United Heritage Bank, with $751 million in assets as of December 31, 2006, has 13 branches in the metropolitan Orlando area. United Heritage shareholders will receive 0.8740 of a share of M&I common stock for each share of United Heritage common stock.

Marshall & Ilsley Corporation (NYSE: MI) is a diversified financial services corporation headquartered in Milwaukee, Wis., with $56.2 billion in assets. Founded in 1847, M&I Marshall & Ilsley Bank is the largest Wisconsin- based bank, with 193 offices throughout the state. In addition, M&I has 46 locations throughout Arizona; 30 offices along Florida’s west coast and central Florida; 17 offices in Kansas City and nearby communities; 17 offices in metropolitan Minneapolis/St. Paul, and one in Duluth, Minn.; three offices in Tulsa, Okla.; and one office in Las Vegas, Nev. M&I’s Southwest Bank subsidiary has 16 offices in the greater St. Louis area. Metavante Corporation, a wholly owned subsidiary, provides a full array of technology products and services for the financial services industry. M&I also provides trust and investment management, equipment leasing, mortgage banking, asset- based lending, financial planning, investments, and insurance services from offices throughout the country and on the Internet ( http://www.mibank.com or http://www.micorp.com ). M&I’s customer-based approach, internal growth, and strategic acquisitions have made M&I a nationally recognized leader in the financial services industry.

Greg A. Smith, Marshall & Ilsley Corporation, +1-414-765-7727