Microsoft’s Edge browser has long been a polarizing choice for users, often seen as a transitional step before switching to alternatives. But the software giant’s push to dominate default browser settings may now face serious regulatory scrutiny. Brazil’s antitrust authority, CADE, has initiated an investigation into Microsoft’s alleged anticompetitive tactics, particularly its Jumpstart program, which reportedly incentivizes manufacturers to preinstall Edge on their devices.
The probe comes after Opera, a member of the Browser Choice Alliance, filed a formal complaint. CADE has already sent requests for information to major PC vendors, including Asus, Acer, Dell, and HP. The letters seek details on whether these companies participated in the Jumpstart program, what restrictions were placed on preinstalling third-party browsers, and the potential financial or commercial fallout if they withdrew from the initiative.
This isn’t the first time Microsoft’s browser strategies have drawn criticism. The investigation also highlights concerns about Windows S Mode, a now-discontinued operating system configuration that locked users into Edge and restricted app installations to Microsoft’s store. While Microsoft quietly phased out S Mode in late 2025, the probe suggests lingering questions about how such practices may have stifled competition.
The broader implications extend beyond Brazil. Regulators in the U.S. and EU have already taken aim at tech giants for similar concerns—most notably, Google’s search exclusivity deals and Meta’s acquisitions of competitors. Microsoft’s case, however, marks a new front in the battle over default settings, which critics argue artificially suppress consumer choice.
For now, the investigation remains in its early stages, with CADE gathering evidence before determining whether Microsoft’s actions violate antitrust laws. If findings align with the complaint, the probe could lead to stricter rules on browser defaults, forcing manufacturers to offer more transparent choices to users.
