On 17 September 2007, the Court of First Instance:
- Dismissed Microsoft's complaint, with the exception of the introduction of a monitoring trustee "with the power to have access, independently of the Commission, to Microsoft's assistance, information, documents, premises and employees and to the source code of the relevant Microsoft products", the costs of which had to be borne by Microsoft.
- Ordered Microsoft to bear 80% of its own costs as well as those of the Commission. Microsoft must also carry the full costs incurred by those companies and industry associations which supported the Commission. Associations and companies that supported Microsoft must bear their own costs.
- Ordered the Commission to pay 20% of its own costs as well as 20% of those of Microsoft.