Core Viewpoint - Opera has filed a lawsuit against Microsoft with Brazil's antitrust agency CADE, accusing Microsoft of unfair advantages with its Edge browser [1] Group 1: Legal Actions - Opera previously complained to the European Commission in December 2007, alleging that Microsoft bundled Internet Explorer with the Windows operating system, resulting in a fine of €561 million against Microsoft [1] - The latest statement from Opera's General Counsel, Aaron McParlan, indicates that Microsoft is obstructing competition in the browser market on Windows [1] Group 2: Market Competition - Opera claims that Microsoft prevents other browsers from being pre-installed on Windows devices and restricts users' ability to download and use alternative browsers [1]