The European Authority plans to recommend that Microsoft pay up to two million euros ($2.5 million) for every day it has failed to disclose information about its operating system to competitors, well informed sources have said.

Microsoft was required to provide information to its rivals on the inner workings of its Windows operating system under a March 2004 ruling by the commission. An advisory committee is expected to meet Monday to discuss a draft decision to impose a fine, and on July 10 to decide on a final fine, said people with knowledge of the case who said they had to speak anonymously because the plans were still pending.

Two million euros a day would be the biggest daily antitrust fine set by the commission. At the time of the ruling, the commission imposed a flat 497.2 million euro ($622 million) antitrust fine on Microsoft.

The commission has said any daily fine will be retroactive to Dec. 15, when Neelie Kroes, the competition commissioner, first threatened Microsoft with daily penalties. The fine could continue indefinitely until the commission determined that Microsoft had complied.

Microsoft has long insisted that it was complying with the European order. Brad Smith, the company’s chief counsel, said in March that Microsoft had already made public “complete and accurate” data on Windows, including more than 12,000 pages of technical information.

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