CMA opens formal investigation into Microsoft's software business as UK cloud market probe widens beyond AWS and Google
The Competition and Markets Authority (CMA) has launched a formal investigation into Microsoft's software business in the UK, extending the regulator's scrutiny of the cloud computing sector beyond its earlier probes into Amazon Web Services and Google Cloud. The investigation focuses on the business software market — the dominant position Microsoft holds through Windows, Microsoft 365, and Azure creating potential competition concerns around cloud switching, interoperability, and customer lock-in. Microsoft's president Brad Smith confirmed the company is committed to working 'quickly and constructively' to address the issues identified, and acknowledged that the CMA will continue to review additional issues relating to Microsoft's products and services. In parallel, Amazon issued a statement formalising commitments around customer choice, including 'clear, comprehensive rights around multicloud adoption, data portability, and switching processes', and committed to continued structured engagement with the CMA. Google was also referenced in the same context. The CMA's cloud market investigation has been running in parallel with the European Commission's own scrutiny of cloud hyperscalers — the concentration of market power in a small number of global providers — creating a coordinated trans-Atlantic regulatory pressure campaign on Big Tech's infrastructure dominance.
Why this matters
The CMA's investigation into Microsoft's software business is the most commercially significant cloud competition action to date given Microsoft's cross-market dominance spanning operating systems, productivity software, and cloud infrastructure. This activates competition law advisory at scale: Microsoft needs UK competition counsel to manage the investigation, respond to information requests, and structure any behavioural or structural remedies the CMA may require. The parallel engagement with Amazon and Google on switching commitments shows the CMA pursuing a sector-wide conduct remedy strategy rather than individual enforcement — a pattern that generates sustained compliance advisory work for all hyperscaler clients. The 'why now' catalyst is the CMA's cloud services market study findings, which identified structural barriers to switching as a systemic concern. For firms with strong tech regulation and competition practices, this investigation represents a multi-year, multi-firm instruction pipeline.
On the Ground
On a CMA investigation of this type, a trainee would draft regulatory notification responses to CMA information requests, prepare compliance gap analysis memos assessing how Microsoft's current conduct aligns with the CMA's stated concerns, and maintain remediation tracker updates documenting the company's commitments and their implementation status.
Interview prep
Soundbite
The CMA's Microsoft probe turns cloud lock-in from a commercial complaint into a formal competition law obligation with remedy risk.
Question you might get
“How does the CMA's market investigation regime differ from a standard Article 101 or 102 TFEU competition enforcement action, and why might the CMA prefer it when dealing with Big Tech platforms?”
Full answer
The CMA has opened a formal investigation into Microsoft's software business, widening its cloud market probe to cover the market leader in business software alongside its earlier scrutiny of Amazon and Google. The core concern is interoperability and switching — the CMA's cloud market study found that customers face structural barriers to moving workloads between providers, with Microsoft's bundling of Windows, Microsoft 365, and Azure reinforcing lock-in. This matters for law firms because Microsoft's response will require sustained competition law advisory spanning information requests, remedy negotiation, and potentially structural changes to licensing terms. Amazon's simultaneous commitment to multicloud portability rights shows the CMA is achieving conduct change across the sector without formal infringement findings — a sophisticated enforcement model. The broader structural shift is the CMA's growing confidence in regulating global tech markets from a UK base post-Brexit, using its market investigation powers more aggressively than the pre-2021 EU-constrained regime permitted.
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