Russia's antitrust authority on Thursday said it had opened an investigation into Microsoft for allegedly abusing its dominance in the antivirus software market. In a statement, the Federal Anti-monopoly Service said it had taken the decision after being contacted by the Moscow-based internet security giant Kaspersky. It accuses Microsoft of reducing to six working days the time for third party software vendors to adapt their antivirus packages to the Windows 10 operating system, compared with two months for earlier versions.