Sun Microsystems is about to add to Microsoft's legal problems, as it claims that the Redmond giant used its monopoly power to block competition from Sun's own Java software tools.
According to reports in the Financial Times, Sun is currently preparing to file a lawsuit against Microsoft for abusing its market leadership.
The two companies have been adversaries across the courtroom before when a bitter battle ensued over Sun's Java programming language. The case was settled in 2001, with Sun receiving $20m.
Since then Microsoft has not included a Java compiler in the Windows XP operating system or the latest version of its Internet Explorer browser.
Last month media and technology conglomerate AOL Time Warner issued a lawsuit against Microsoft alleging that it had illegally restricted competition from the Netscape Navigator browser.
Microsoft still has legal battles to face with nine US states pursuing a settlement in the antitrust case initiated by the Department of Justice.
The European Commission's antitrust case still continues.
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