Microsoft Corp.'s move to let users cripple Internet Explorer 8 (IE8) isn't enough to solve its newest antitrust problems with European Union regulators, according to the head of the company that filed the original complaint.

"That's one possible step," said Jon von Tetzchner, the CEO of Opera Software ASA. "But it doesn't really change much, does it?"

A December 2007 complaint submitted by Opera to the European Commission prompted the antitrust agency to charge Microsoft in January 2009 with stifling competition by bundling its browser with Windows. Specifically, the commission said that Microsoft "shields" IE from completion by distributing the application with its operating system.

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