Microsoft Continues to Allegedly Bypass Fair Competition in Default Browser Settings, According to Opera
In a move aimed at leveling the playing field for browser competition, Opera has filed an antitrust complaint against Microsoft with Brazil's competition authority (CADE). The complaint alleges that Microsoft engages in anti-competitive practices favouring its Edge browser in Windows 11.
The complaint focuses on several key issues. Firstly, Microsoft bundles Edge as the exclusive pre-installed browser in Windows 11, a practice that Opera claims is manipulative and frustrates users from switching browsers. Secondly, the complaint alleges the use of "dark patterns" in Microsoft's design, which are tactics intended to influence user behaviour in ways that may not be immediately apparent.
Furthermore, the complaint suggests that Microsoft employs pressure tactics on PC manufacturers, conditioning bundled rebates on the delivery of Windows devices in S mode. This mode, a locked-down version of Windows, only allows apps from the Microsoft Store and uses Edge for browsing, restricting users from downloading browsers like Opera.
Opera argues that these practices violate competition laws by giving Edge an unfair advantage over rival browsers, despite Opera's significant user base in Brazil. As of early August 2025, Opera's market share in Brazil stands at 6.78 percent, compared to Edge's 11.52 percent and Chrome's 74.95 percent. On a global scale, Opera's market share is 2.65 percent.
In response to the charges, Microsoft has been given until August 15, 2025, to respond. The inquiry covers not only the Edge browser default setting and bundling but extends to Microsoft's broader commercial practices around Windows licenses and related programs.
The case remains in the investigative stage with CADE examining evidence and awaiting Microsoft's formal response. There are no formal charges or rulings yet. The case is part of a global pushback against Microsoft's bundling and default-setting practices amid increasing regulatory scrutiny worldwide.
In light of these allegations, Opera believes Microsoft should present a browser choice screen to all users in a user-friendly and unbiased format, including the main available PC browsers in Brazil. This would allow users to make an informed decision about their preferred browser at the point of installation, similar to measures taken in response to complaints about Internet Explorer's dominance in the past.
- Opera insists that Microsoft should also offer a choice of mobile browsers, like Opera, during the installation process of Windows 11, similar to past measures aimed at addressing browser dominance issues.
- The AI technology behind Opera's browser could find more opportunities to reach users in Brazil if Microsoft adopts a practice of providing a neutral choice of browsers, promoting a fairer and more competitive technology sector.
