At a two-day closed hearing that began on Thursday, Microsoft defended itself against the fines the Commission set for what it calls as delays in observing a 2004 antitrust decision.
The Commission then accused Microsoft of abusing the dominance of its Windows operating system to hurt rivals.
It fined the U.S. company nearly half a billion euros and ordered it to share information with rival makers of software used in servers – powerful computers used for businesses, universities and governments.
No conclusions will be reached at the highly publicized hearing, which is held by a hearing officer acts as a referee between the parties and does not make a decision. The Commission said it will decide whether to proceed with or drop the fines within several weeks.
As part of the remedies in the 2004 decision, Microsoft was ordered to share information with rivals so they can make software, such as those running printers, work as smoothly with Windows desktop machines as Microsoft’s own software.
Microsoft says it has more than met the Commission’s demands and that it is willing to do more.