The UK CMA’s Microsoft Decision Is a Proposal. The Consultation Is the Next Milestone

A UK competition regulator has moved its Microsoft business-software investigation from evidence gathering to a proposed designation. That is a meaningful procedural step, but headlines that describe Microsoft as already formally designated skip the part now under way: consultation. The Competition and Markets Authority says its provisional assessment is that Microsoft meets the statutory conditions for strategic market status in the business software ecosystem. It has invited evidence before making a final decision, which it expects by February 13, 2027.

What the CMA has proposed

The CMA’s October 16 announcement says it proposes to designate Microsoft with strategic market status in its UK business software ecosystem. The CMA describes that ecosystem broadly: Word, Excel, Outlook, PowerPoint, Teams and Copilot, alongside security, server and operating-system products. Its scope includes Microsoft’s expanding AI workplace tools; our earlier Copilot consolidation coverage looks at the product side of that same changing suite. It says the investigation is examining how Microsoft’s position affects UK businesses and public-sector organizations, including possible concerns around bundling and the ability of other developers to integrate with Microsoft’s software. ^[1]

The distinction between “proposed” and “final” matters. The consultation document calls the finding provisional and asks interested parties to respond. The CMA has not yet issued the final decision notice, and its accompanying roadmap identifies areas for further evidence and possible intervention only if the designation is ultimately made. The process remains open to argument and evidence from Microsoft and other affected parties. ^{[2] [3]}

Why enterprise buyers should pay attention now

For organizations, the immediate relevance is planning rather than emergency migration. The CMA’s possible future action areas include bundling and software integration, both of which can affect how a business combines office software, security products, AI tools and third-party services. The roadmap is not itself an order to change contracts or technical architecture. It signals where the regulator may gather evidence if the proposed designation proceeds. ^{[1] [3]}

The CMA says the relevant products are used by more than a million businesses and public-sector organizations in the UK, with around 20 million monthly users. Those figures are the regulator’s description of the UK market context, not an independent estimate of switching costs or the number of organizations that would be affected by a remedy. Individual buyers still need to assess their contracts, integrations and operational dependencies rather than assume a future rule will solve them. ^[1]

If your organization is affected, document concrete examples: which product combinations you buy, what alternatives you evaluated, what integration barriers you encountered, how switching works in practice, and what technical or contractual costs appear. The consultation page explains how to respond and how to mark confidential material. It also says a non-confidential version should accompany confidential submissions where appropriate. The response deadline is 5 p.m. on November 13, 2026. ^[2]

The decision path and dates

The case page lists a consultation close in November, further evidence gathering and engagement after that, then a final decision process through February. February 13, 2027 is the statutory deadline for the decision notice. The current roadmap is indicative; the CMA says its expected phases may change. Check the case page for updates before treating any milestone as fixed. ^[3]

The legal framework is the UK Digital Markets, Competition and Consumers Act 2024. The CMA’s process under that Act includes criteria for strategic market status and powers to impose conduct requirements after designation. A proposed designation is therefore a threshold decision in a broader process. The presence of a possible intervention in the roadmap does not establish that the CMA will adopt it, or what its exact scope would be. ^[4]

What has not happened

Microsoft has not yet received a final SMS designation in this case. The CMA has not imposed new conduct rules through this proposed decision, and the roadmap is not a list of requirements already binding on the company. The regulator may revise its position after reviewing consultation responses and further evidence. This article describes the published procedure and dates; it does not provide legal advice about any organization’s contracts or rights.

For UK buyers, the useful action is to keep a dated record of software dependencies and monitor the CMA case page, especially if bundling or interoperability affects a current purchase or integration decision. For developers, the consultation is an opportunity to provide specific, reproducible evidence about integration barriers. For everyone else, the accurate status is simple: the proposal is significant, but the decision is still pending.