The European Commission has praised Microsoft"s initial response to its antitrust ruling against the company. Last week, Microsoft successfully met a deadline to give details of how it would improve the way it opens up its Windows operating systems to rivals. Microsoft had faced fines of up to $5m (£2.7m) a day if it failed to reply to Brussels by the 1 June deadline. The European Commission will now see what Microsoft"s rivals think of the plans before it makes a final decision.