Oracle on Monday mounted a strident attack on Europe’s competition authorities as it confirmed it had received an official objection from Brussels to its proposed $7.4bn acquisition of Sun Microsystems. The US software company also said it would “vigorously oppose” the European Commission’s position. The official statement of objections, which has been sent to Oracle and not made public, comes two months after EU regulators first revealed they might have concerns. A formal objection is the first step towards possible action to block a deal.