Windows is the leading desktop operating system with more than 70% of desktops using it globally, according to StatCounter. As of January 2022, 1.4 billion monthly active devices ran Windows 10 and Windows 11, and the number of devices running Windows 11 more than doubled in 2023. In October 2025, Microsoft will end support for Windows 10, pushing millions of users to Windows 11 — an opportune moment for effective regulatory oversight.

Browsers are not just the gateway to the internet, but also a key enabler of other important services, such as AI and productivity tools. The browser market has significant potential for direct economic impact. Accounting for over 40% of internet use globally and about 50% of internet use in the US and Europe, desktop continues to be a very important way for users to access the internet and apps, as well as for developers to be found by users. This is especially true in important educational and enterprise applications. However, Microsoft restricts the ability of rival software to compete on Windows by creating onerous restrictions for competitors that frustrate consumer choice.

The Browser Choice Alliance aims to promote genuine competition in the desktop browser market. This will support growth and innovation for the benefit of consumers and developers alike.