On 6 March 2013, the European Commission (Commission) imposed a EUR 561 million fine on Microsoft for failure to comply with its binding commitments to enable Windows users easily to choose their preferred web browser. This is the first time the Commission has imposed fines for failure to comply with a so-called "commitment decision", i.e. where the Commission accepts binding commitments from companies that are suspected of having breached competition law, in order to address competition concerns, and closes the investigation without making a finding as to whether or not there has been an infringement.

On 16 December 2009, the Commission adopted a commitment decision, accepting binding commitments offered by Microsoft to meet certain competition concerns, which related to the allegedly abusive tying of Microsoft's web browser, Internet Explorer to its PC operating system, Windows. In order to address the Commission's concerns, Microsoft committed to display a browser choice screen to Windows users within the European Economic Area (EEA) until 2014. This would enable Windows users to choose which web browser to install from a selection of the most widely used web browsers.

However, the choice screen was not displayed on some computers. Following a number of complaints, the Commission opened an investigation in July 2012 into Microsoft's possible breach of binding commitments. During the investigation, Microsoft acknowledged that it had failed to display the choice screen to users of Windows 7 Service Pack 1.

The Commission found that Microsoft had failed to comply with its commitments by not displaying the choice screen to users who have Internet Explorer set as the default browser. The Commission concluded that Microsoft's failure to comply lasted for 14 months and affected approx. 15.3 million users. As a counterfactual, the Commission noted that the choice screen, when functioning, was used to download 84 million web browsers between March and November 2010. Although Microsoft argued that the failure to provide the choice screen resulted from a technical error, the Commission considered Microsoft's breach to be a serious one. The Commission stated that, given Microsoft's resources and know-how, Microsoft should have been able to avoid such errors and should have had better processes in place to ensure that the choice screen was correctly displayed to affected users. In setting the fine, the Commission took into account, as a mitigating circumstance, the fact that Microsoft cooperated with the Commission by providing evidence which helped the Commission to investigate the case more efficiently.

The EUR 561 million fine amounts to approx. 1 per cent of Microsoft's worldwide turnover for its fiscal year ending 30 June 2012 and is the latest in a series of fines imposed on Microsoft by the Commission and EU courts, now totalling more than EUR 2 billion.

As stated above, a commitment decision enables the Commission to close antitrust investigations without finding an infringement, in exchange for the relevant commitments. The Commission has recently made extensive use of commitment decisions.

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