Opera to File Complaint Against Microsoft with Brazilian Antitrust Authority CADE Over Edge Browser Practices

Opera is expected to file a complaint with Brazil's CADE against Microsoft, alleging that the latter is giving its Edge browser an unfair advantage over rivals. The complaint follows a similar one filed by Opera with the European Commission in 2007 regarding Microsoft's tying of Internet Explorer to its Windows operating system.

Norwegian browser maker Opera has filed a complaint with Brazil's antitrust authority CADE against U.S. tech giant Microsoft. The complaint alleges that Microsoft's Edge browser is being given an unfair advantage over rival browsers, echoing a similar case Opera brought to the European Commission in 2007 against Microsoft's bundling of Internet Explorer with Windows [1].

Opera's general counsel, Aaron McParlan, stated that Microsoft's pre-installation of Edge as the default browser on Windows devices and computers prevents competitors from gaining a level playing field. He highlighted that Microsoft's tactics include locking out rival browsers from important preinstallation opportunities and frustrating users' ability to download and use alternative browsers [1].

The complaint also alleges that Microsoft provides incentives to major PC manufacturers to pre-install Edge exclusively on Windows devices and uses anti-competitive measures such as design tactics or dark patterns to steer users towards Edge [1].

Opera, which claims to be the third-most popular PC browser in Brazil, has requested CADE to investigate Microsoft and demand concessions to ensure fair competition [1].

Microsoft has not provided an immediate comment on the matter.

References:
[1] Reuters. (2025, July 29). Microsoft hit with Opera complaint to Brazilian antitrust regulator. Retrieved from https://www.reuters.com/legal/litigation/microsoft-hit-with-opera-complaint-brazilian-antitrust-regulator-2025-07-29/