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    Home > Headlines > Microsoft hit with Opera complaint to Brazilian antitrust regulator
    Headlines

    Microsoft hit with Opera complaint to Brazilian antitrust regulator

    Published by Global Banking & Finance Review®

    Posted on July 29, 2025

    2 min read

    Last updated: January 22, 2026

    Microsoft hit with Opera complaint to Brazilian antitrust regulator - Headlines news and analysis from Global Banking & Finance Review
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    Tags:innovationtechnologyfinancial services

    Quick Summary

    Opera has filed a complaint against Microsoft to Brazil's CADE, alleging unfair competition by pre-installing Edge on Windows, affecting browser competition.

    Table of Contents

    • Opera's Antitrust Allegations Against Microsoft
    • Background of the Complaint
    • Details of the Allegations
    • Call for Investigation

    Microsoft hit with Opera complaint to Brazilian antitrust regulator

    Opera's Antitrust Allegations Against Microsoft

    By Foo Yun Chee

    Background of the Complaint

    BRUSSELS (Reuters) -Norwegian browser maker Opera filed a complaint about U.S. tech giant Microsoft to Brazilian antitrust authority CADE on Tuesday alleging its Edge browser has an unfair advantage, underscoring the long-running rivalry between the two companies.

    Details of the Allegations

    Opera complained to the European Commission in December 2007 about Microsoft tying its Internet Explorer browser to its Windows operating system. The case eventually ended with a 561 million euro (USD conversion) EU antitrust fine for the U.S. company.

    Call for Investigation

    In July last year, Opera took the Commission to court for exempting Edge from the Digital Markets Act, which aims to rein in the power of Big Tech via a list of dos and don'ts.

    In its complaint to CADE seen by Reuters, Opera alleged that Microsoft's pre-installation of Edge as the default browser across Windows devices and computers prevents rivals from competing on the merits of the products.

    "Microsoft thwarts browser competition on Windows at every turn. First, browsers like Opera are locked out of important preinstallation opportunities," Opera's general counsel, Aaron McParlan, said in a statement.

    "And then Microsoft frustrates users' ability to download and use alternative browsers," he said.

    Microsoft had no immediate comment.

    Opera, which said it is the third-most popular PC browser in Brazil, added that Microsoft's alleged tactics included giving incentives to major PC manufacturers to pre-instal Edge exclusively on Windows on all their Windows devices.

    Opera also alleged that Microsoft used anti-competitive measures such as design tactics or dark patterns to steer PC users away from rival browsers to Edge.

    Opera called on CADE to investigate Microsoft and to demand concessions to ensure fair competition.

    (Reporting by Foo Yun Chee; Editing by Matthew Lewis and Stephen Coates)

    Key Takeaways

    • •Opera files antitrust complaint against Microsoft in Brazil.
    • •Allegations focus on Edge browser's pre-installation on Windows.
    • •Opera claims Microsoft's tactics hinder browser competition.
    • •Previous complaints were made to the European Commission.
    • •Opera seeks CADE investigation and fair competition measures.

    Frequently Asked Questions about Microsoft hit with Opera complaint to Brazilian antitrust regulator

    1What is an antitrust complaint?

    An antitrust complaint is a legal accusation that a company is engaging in unfair competition practices that violate antitrust laws, which are designed to promote fair competition and prevent monopolies.

    2What is a default browser?

    A default browser is the web browser that is automatically used to open web pages when a user clicks on links or types a URL, unless another browser is specified by the user.

    3What are anti-competitive practices?

    Anti-competitive practices are actions taken by companies to reduce or eliminate competition in a market, which can include monopolistic behavior, price fixing, and exclusive agreements.

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