Microsoft Corp. said last week that six major financial services firms have begun to install new computer networks based on the software giant's Windows NT operating system.

Citicorp, Keycorp, Merrill Lynch & Co., Charles Schwab & Co., Sanford C. Bernstein & Co., and Interstate/Johnson Lane all have committed to system projects based on Windows NT, officials said in New York during a financial services technology conference sponsored by Redmond, Wash.-based Microsoft last week.

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