UK Watchdog Moves to Place Microsoft Under Strategic Market Status

The United Kingdom’s Competition and Markets Authority (CMA) has taken a major step towards increasing regulatory oversight of Microsoft’s business software ecosystem. On October 16, 2026, the regulator announced a proposed decision to designate Microsoft with Strategic Market Status (SMS) under the UK’s digital markets competition regime. The investigation focuses on Microsoft’s influential position in workplace software, including Windows, Word, Excel, Teams and its growing range of artificial intelligence products. The CMA said its preliminary findings indicate that Microsoft holds strong positions across several important digital markets and that customers may face barriers when attempting to switch to competing services. The proposal is not yet a final decision, and the regulator is consulting interested parties before determining whether the designation should proceed.

A central concern is the extent to which Microsoft’s interconnected products can make it difficult for businesses to choose alternative providers. Organisations often rely on several Microsoft services simultaneously, including operating systems, productivity applications, security tools and cloud infrastructure. The CMA believes this interconnected ecosystem may create significant switching costs and limit the ability of rival companies to compete on equal terms. According to the regulator, around 20 million people in the UK use Microsoft’s business software each month. Its investigation has examined five areas of digital activity: PC operating systems, productivity software, security software, server operating systems and database management systems. The CMA argues that Microsoft’s position across these areas could affect competition and the choices available to businesses and public-sector organisations.

Microsoft’s bundling and licensing practices are among the issues receiving particular attention. The CMA is examining whether combining products such as Teams, Excel and other workplace applications with Microsoft’s broader software offerings limits customer choice or disadvantages competing providers. The regulator is also investigating whether Microsoft’s licensing arrangements affect businesses’ ability to use alternative cloud services. Another concern involves Microsoft Copilot, the company’s AI assistant, which is increasingly integrated into workplace applications. The CMA wants to determine whether Microsoft’s established distribution channels give Copilot an advantage over competing AI tools and whether customers can freely combine Microsoft software with products from rival developers. Microsoft has rejected the regulator’s assessment, arguing that its products, including Copilot, are open and interoperable and can be used alongside competing services.

If Microsoft receives the designation, the CMA could gain additional powers to introduce targeted measures intended to improve competition. Potential interventions could address product bundling, licensing conditions, interoperability and customers’ ability to move between providers. Such measures might require Microsoft to make it easier for businesses to combine its services with competing products or choose alternative solutions without unnecessary barriers. However, the proposed designation does not automatically mean that Microsoft has broken the law. The UK’s Strategic Market Status framework is designed to address the market position of powerful digital companies and enable proportionate measures where legal requirements are met. The CMA has also indicated that it is pursuing improvements in cloud-service portability through separate engagement with Microsoft and Amazon Web Services, particularly concerning identity management and the movement of workloads between cloud platforms.

The case could have significant implications for the future of workplace technology and the development of AI-powered software in Britain. Greater interoperability could give businesses more freedom to select applications based on their needs rather than remaining within a single provider’s ecosystem. It could also create opportunities for smaller software developers and competing AI companies to reach customers who currently rely heavily on Microsoft products. At the same time, any regulatory changes would need to consider security, compatibility, costs and the practical challenges of managing complex business systems. The CMA is inviting responses to its proposed decision until November 13, 2026, and expects to make a final decision by February 13, 2027. Until then, Microsoft’s proposed designation remains under consultation, and the precise scope of any future regulatory intervention has not been determined.