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Neelie Kroes renewed concerns were prompted by statistics that showed that Microsoft's share of server market has risen to 75 per cent. In 1999, when the European Commission began its investigation, that figure stood at between 35 and 40 per cent, rising to 60 per cent by 2004.

'Microsoft is constantly gaining market share and that is what is worrying me in the work group server operating market,' she told the European Parliament. 'As a consequence of your abusive behaviour you are getting positive results for the company - that's not acceptable in my opinion.'

Since the ruling was made, the Commission has rejected

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several submissions that Microsoft believed fulfilled the ruling's requirements. Earlier this month it announced that Quest was the first company to license the latest published version of the protocols, but Kroes said that the terms of the licence were unacceptable, as Microsoft was charging a fee for technologies that it had not developed itself. The Commission's position is that it may only charge for protocols that are innovative. Microsoft says that all the protocols contain valuable intellectual property and maintains that it should be entitled to charge for them.

'Other government agencies in both the United States and Europe have already found considerable innovation in Microsoft's protocol technology,' Microsoft's general counsel Brad Smith said recently. 'US and European patent offices have awarded Microsoft more than 36 patents for the technology in these protocols, which took millions of dollars to develop, and another 37 patents are pending, so it's hard to see how the Commission can argue that even patented innovation must be made available for free.'

Microsoft is appealing the 2004 ruling.