The UK's Competition and Markets Authority announced on Tuesday that it has opened a strategic market status investigation into Microsoft's business software ecosystem, a probe that will examine whether the company's dominance in productivity applications, operating systems, databases and security software is limiting customers' ability to combine Microsoft products with those of rival providers.
The investigation is the CMA's fourth under the digital markets competition regime established by the Digital Markets, Competition and Consumers Act, which came into force last year. If the regulator designates Microsoft with strategic market status, it would gain the power to impose targeted interventions, from mandating interoperability to restricting bundling practices, without needing to prove a specific abuse of dominance under traditional competition law.
What makes this investigation different from the CMA's earlier cloud services review, which concluded that Microsoft and Amazon Web Services were using their dominance to harm customers, is the explicit inclusion of artificial intelligence in the scope.
The regulator said the review "includes looking at how AI competitors are able to integrate with Microsoft's business software," language that transforms the investigation from a backwards-looking assessment of Office and Windows licensing into a forward-looking examination of whether Microsoft's ecosystem advantages are being extended into the AI market before competitors have a chance to establish themselves.
The concern is structural. Microsoft's business software sits on hundreds of millions of corporate desktops worldwide. Its Azure cloud hosts the majority of OpenAI's computing workloads. Its Copilot AI assistant is embedded across the entire Microsoft 365 suite.
If enterprises cannot easily integrate competing AI products, whether from Anthropic, Google or smaller providers, into the Microsoft environment their organisations depend on, the AI market risks being foreclosed by default rather than by merit.
Google and Amazon have pressed this argument for years. Google has publicly accused Microsoft of imposing a licensing "tax" on customers who run Windows Server on competing clouds, claiming the cost differential can reach four times the price of running the same software on Azure.
AWS has made similar complaints. The CMA's earlier cloud investigation estimated that Microsoft's licensing practices could have cost UK enterprise customers an additional £500 million annually.
Microsoft has pushed back firmly, describing rivals' lobbying as "extraordinary and unprecedented" and positioning its licensing terms as standard commercial practice. A spokesperson told The Register the company is "committed to working quickly and constructively with the CMA to facilitate its review."
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The nine-month investigation timeline, with a decision due by February 2027, means the CMA will be assessing Microsoft's market position during precisely the period when enterprise AI adoption is expected to accelerate most rapidly. If the regulator concludes that Microsoft's bundling of Copilot with Office 365, its preferential Azure pricing and its control of the desktop operating system create barriers that AI competitors cannot overcome, the interventions it imposes could reshape how the AI market develops across Europe.
For Microsoft, the investigation arrives alongside the European Commission's Digital Markets Act enforcement, ongoing US antitrust scrutiny and the company's own Copilot strategy retreat. The regulatory pressure from multiple jurisdictions is converging on a single question: whether the company that dominates enterprise productivity software should also be permitted to dominate the AI layer that sits on top of it.
The recap
- UK CMA opens review of Microsoft business software ecosystem
- Investigation is the fourth under new digital markets regime
- Decision on strategic market status due by February 2027
