While most financial institutions have fled the business of managing data processing operations for other banks, M&I Data Services, the technology unit of Marshall & Ilsley Corp., has made a healthy living at it.

With Mellon Bank's sale of its business to Fisery Inc. this summer, Milwaukee-based M&I became the only financial institution among the top 10 processors of core deposit and lending transactions - a business that dozens of banks once saw as a lucrative source of fee income.

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