The European Commission has initiated two new formal investigations against Microsoft in relation to alleged abuse by the American company of its dominant position. The first investigation concerns a complaint lodged by the European Committee for Interoperable Systems, according to which Microsoft refused to disclose interoperability information across a range of products. The second investigation relates to the tying of Microsoft’s Internet Explorer product to the Windows operating system. In conducting the investigation, the Commission will rely to a significant extent on the Court of First Instance judgment of 2007 on the first Microsoft case.