Sun Microsystems, the United States computer company has filed an anti-trust lawsuit worth more than £700 million against its rival, Microsoft.

In June last year, the Federal Court of Appeals found Microsoft guilty of abusing its monopoly position with respect to Sun and the Java platform.

Michael Morris, Sun's general counsel, said: "While this suit is based on the past actions of Microsoft, Sun also believes that Microsoft's continuing practices in the marketplace represent a threat to lawful competition and the millions of developers who depend on the existence of an open software industry."

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