The European Commission announced the opening of proceedings against Microsoft in order to investigate whether the company has failed to comply with its 2009 commitments to offer users a choice screen enabling them to easily choose their preferred web browser. In particular, the Commission believes that Microsoft may have failed to roll out the choice screen with Windows 7 Service Pack 1, which was released in February 2011.

Microsoft will be investigated by the European Commission in order to know whether the company has failed to comply with its 2009 commitments to offer users a choice screen enabling them to easily choose their preferred web browser. The opening of proceedings does not prejudge the outcome of the investigation; it only means that the Commission will treat the case as a matter of priority.

On 16 December 2009, the Commission made legally binding on Microsoft commitments offered by the US software company to address competition concerns the Commission had identified. These concerns related to the tying of Microsoft's web browser, Internet Explorer, to its dominant client PC operating system, Windows. Specifically, Microsoft committed to make available for five years (i.e. until 2014) in the European Economic Area a "Choice Screen" enabling users of Windows to choose in an informed and unbiased manner which web browser(s) they wanted to install in addition to, or instead of, Microsoft's web browser.

The Commission believes that Microsoft may have failed to roll out the choice screen with Windows 7 Service Pack 1, which was released in February 2011. This is despite the fact that, in December 2011, Microsoft indicated in its annual compliance report to the Commission that it was in compliance with its commitments. From February 2011 until today, millions of Windows users in the EU may have not seen the choice screen. Microsoft has recently acknowledged that the choice screen was not displayed during that period.