European Union competition regulators launched two anti-trust investigations against International Business Machines Corp, suspecting it of abusing its dominant position in the mainframe computer market.One investigation followed complaints by emulator software vendors T3 Technologies Inc and TurboHercules against IBM's practices, and focuses on the U.S. computer group's alleged tying of mainframe hardware to its mainframe operating system.The second probe, opened on the European Commission's own initiative, concerns alleged discriminatory behavior toward competing suppliers of mainframe maintenance services.

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