At a hearing with the EC (European Commission) today, Microsoft will use success stories from its server protocol licensing program in the US to try to convince European regulators that it is complying with an antitrust ruling and avoid being fined millions of euros per day.

Microsoft's lawyers are to meet with EC representatives at a hearing in Brussels to determine whether the software maker complied with the 2004 antitrust ruling against it. The EC contends that the company has not complied, and is threatening to impose daily fines of €2 million (about £1.37m) until it does.

At issue is a provision that required Microsoft to license communications protocols for its workgroup server software to competitors, a measure intended to level the playing field by allowing rivals to build products that work well with Microsoft's ubiquitous Windows software. The company was required to offer a similar licensing programme in the US after it was found guilty of antitrust violations there.

Microsoft will submit statements to the EC today from six technology companies that, it claims, successfully used that US licensing programme. Among them is EMC, which used the documentation "as a reference guide to fill in gaps in EMC's existing implementation of the file server protocols, particularly the SMB protocol", the statement from EMC says, according to Microsoft.

The other companies include storage vendor Network Appliance, videoconferencing vendor StarBak Communications and video-on-demand vendor Tandberg Television.

Of the 55 protocols offered under the European licensing programme, 46 are also part of the US licensing programme, according to Microsoft.

It was not immediately clear, however, if the protocols are documented in the same way, and if the testimony of vendors who took part in the US programme will sway the EC's view.

"What we're saying is that the documentation has been created to the same standard," Microsoft spokesman Tom Brookes said.

Microsoft repeated its assertion that it wants to comply with the EC's requirements but argued that it needs "concise and consistent information" about what is required.

The company invited several industry analysts to view its European protocol documentation in London recently, in an effort that was "partly public relations but also to get our view on how the documentation looks", according to Gary Barnett at UK analyst company Ovum, who was among those who attended.

"I was really surprised when I saw the documentation Microsoft had put together. I was expecting, based on what I had heard, something much less complete. But I'd have to say – with the caveat that this is based on the two or three examples we saw – that it was quite impressive," Barnett said.

One of the problems, he said, is that the usefulness of the documentation depends partly on who it's intended for.

"Should [Microsoft] be providing a document that would allow a first-year computer science student to create an entire protocol, or are they entitled to assume that if you're setting up business to implement the protocols that you'll hire a few Microsoft platform Jedis?" he asked.

"That's not clearly enumerated, and it's the fault of the European Union for not making it clear, and it's also Microsoft's fault for agreeing to comply with such a request."

James Governor, an analyst at RedMonk who also saw the documentation, said: "It's a system that kind of works."

The problem, he said, is that companies don't want to have to become Microsoft licensees in order to make competing products, and the fees Microsoft is proposing for the licensing programme are too high for small companies.

Microsoft had been scheduled to hold a press conference early this afternoon, but it cancelled it, citing "a request to respect the confidentiality of the process" from the EC's hearing officer.

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