Published by Global Banking & Finance Review®
Posted on August 1, 2025
2 min readLast updated: January 22, 2026
Add as preferred source on GoogleBrazil's CADE investigates Microsoft after Opera's complaint about Edge's dominance. Microsoft must respond by August 15. Opera has long challenged Microsoft's browser practices.
By Foo Yun Chee
BRUSSELS (Reuters) -Brazil's antitrust enforcer CADE has opened an investigation into Microsoft, days after Norwegian browser Opera complained about Microsoft's Edge, according to a CADE statement published late Thursday on its website.
Opera, in its complaint filed on Tuesday, alleged that Microsoft pre-installs Edge as the default browser across Windows devices and computers, thereby preventing rivals from competing on the merits of the products.
Opera had 6.78% of the Brazilian desktop browser market in June versus Edge's 11.52% and market leader Google Chrome's 75%.
CADE said it had opened an administrative inquiry and set an August 15 deadline for Microsoft to respond to Opera's allegations about its Windows operating system licences, the Microsoft 365 software and its Jumpstart programme.
The Jumpstart programme allows Microsoft clients to build autonomous artificial intelligence agents for routine tasks, a move which could help the company monetise its billion-dollar investments in AI. Other Big Tech companies have similar tools.
Microsoft did not immediately respond to emailed requests for comment.
Opera has been complaining about its competitor since December 2007 when it took its grievance about the latter's internet Explorer browser bundled with its Windows operating system to the European Commission, resulting in a 561-million-euro ($640 million) fine for the U.S. tech giant.
($1 = 0.8764 euros)
(Reporting by Foo Yun Chee;Editing by Elaine Hardcastle)
The investigation was prompted by a complaint from Opera, which alleged that Microsoft pre-installs Edge as the default browser on Windows devices, hindering competition.
CADE has set an August 15 deadline for Microsoft to respond to Opera's allegations regarding its Windows operating system licenses.
As of June, Microsoft Edge held 11.52% of the Brazilian desktop browser market, while Opera had 6.78%, with Google Chrome leading at 75%.
Opera first raised complaints against Microsoft in December 2007 regarding the bundling of Internet Explorer with the Windows operating system.
The Jumpstart programme allows Microsoft clients to build autonomous AI agents for routine tasks, which could help the company monetize its significant investments in AI.
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