"European Union judges delved on Thursday into the technical quagmire at the heart of Microsoft's challenge to a landmark European Commission decision that the software giant illegally muscled out rivals.

In a weeklong hearing at Europe's second-highest court, the Court of First Instance, 13 judges are weighing whether to uphold the decision to order Microsoft to change its business practices and fine it a record $617 million (497 million euros).
The Commission's reputation as Europe's top antitrust authority hinges on the outcome of the hearing.
In 2004, the Commission said Microsoft must give rivals more information so their print, file access and log-in server software could work smoothly with its Windows system, used by 95 percent of the world's PCs."

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