Russian security software maker Kaspersky Lab has filed antitrust complaints against Microsoft with the European Commission and the German federal cartel office, it said in a statement on Tuesday. From a report: Kaspersky sent a formal complaint to European Union and German antitrust regulators, saying "hurdles" created by Microsoft limit consumer choice and drive up the cost of security software. "With the release of Windows 10, Microsoft started to create obstacles to competing manufacturers of security solutions, and introduce different ways of pushing users to forgo third-party software in favor of its own Windows Defender," Moscow-based Kaspersky said in a statement. In a statement, Eugene Kaspersky said, "We see clearly -- and are ready to prove -- that Microsoft uses its dominant position in the computer operating system (OS) market to fiercely promote its own -- inferior -- security software (Windows Defender) at the expense of users' previously self-chosen security solution. Such promotion is conducted using questionable methods, and we want to bring these methods to the attention of the anti-competition authorities."