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UK to launch antitrust probe into Microsoft's business software

Published by Global Banking & Finance Review

Posted on March 31, 2026

3 min read

· Last updated: April 1, 2026

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UK to launch antitrust probe into Microsoft's business software
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LONDON, March 31 (Reuters) - Britain's competition regulator said on Tuesday it would launch a new investigation into Microsoft's business software ecosystem in May, including its use of software

Microsoft faces second major UK investigation over cloud licensing

UK Competition Regulator Launches New Probe into Cloud Licensing Practices

By Paul Sandle

LONDON, March 31 (Reuters) - Britain's competition regulator said on Tuesday it would again investigate Microsoft’s software‑licensing practices in the cloud market as part of a broader probe, months after declining to act on earlier findings.

Background: Previous Findings and Market Dominance

Last year a Competition and Markets Authority inquiry group found the dominance of Amazon and Microsoft was harming competition in cloud computing, with the latter singled out for its licensing practices.

Microsoft’s Licensing Practices

It said Microsoft was using its power in enterprise software, such as Windows Server and Microsoft 365, to limit competition by charging licensing fees when its services were used on rival platforms.

Global Antitrust Scrutiny

PRAGMATIC ACTION

Antitrust authorities in the European Union and the United States are also investigating the cloud computing market.

Industry Response and Market Shares

The CMA said on Tuesday that Amazon and Microsoft were taking "material steps" to lower some of their fees in the cloud market following its previous investigation.

Market Share Breakdown

The two companies have around 30-40% shares in cloud services such as processing, storage and networking. Google is the third main provider, with a smaller share of 5-10%.

Details of the New CMA Investigation

The CMA said its new investigation into Microsoft's business software ecosystem would allow it to assign the company with "strategic market status" in business software, which would allow it to make targeted interventions in software licensing.

Regulator’s Approach

CMA chief executive Sarah Cardell said the regulator was acting in a "flexible, pragmatic way to deliver real impact, as quickly as possible for UK customers".

Focus on Cloud Services

"Cloud remains central to our approach – we've seen real progress through our engagement with Microsoft and Amazon to drive meaningful improvements on egress fees and interoperability and we expect more action from them over the coming months," she said.

Company Statements

Microsoft’s Response

Microsoft said the changes it had agreed with the CMA were focused on charges for moving data, switching, and interoperability.

"The changes address the CMA's commitment to ensuring that UK customers can continue to move, deploy, and operate their workloads in the clouds of their choice with confidence, flexibility, and ever reduced friction," vice chairman and president Brad Smith said in a statement.

Amazon’s Response

Amazon said the steps it had taken - around multicloud adoption, data portability and switching - formalised its commitment to customer choice.

(Reporting by Paul Sandle; Editing by Muvija M, Editing by Louise Heavens)

Key Takeaways

  • The CMA plans to investigate Microsoft’s software licensing and possible 'strategic market status' designation in its May kickoff, following findings that its licensing practices may disadvantage rivals in the cloud sector.
  • Earlier CMA findings highlighted that Microsoft and Amazon hold significant unilateral power in UK cloud infrastructure, prompting the inquiry and potential intervention under the Digital Markets, Competition and Consumers Act.
  • Separate proceedings include a UK collective lawsuit seeking £2 billion over alleged overcharging for Windows Server licensing on rival clouds, plus the CMA’s shift to Strategic Market Status probes in early 2026.

References

Frequently Asked Questions

Why is the UK launching an antitrust probe into Microsoft?
The UK regulator is investigating Microsoft's business software and cloud licensing practices for potential competition concerns.
Who is conducting the Microsoft business software investigation?
The UK's Competition and Markets Authority (CMA) is conducting the inquiry.
What could happen if Microsoft is given 'strategic market status'?
The CMA could gain power to act on Microsoft's software licensing practices if it assigns strategic market status.
When will the new antitrust investigation into Microsoft begin?
The new investigation by the CMA is set to begin in May.
How have Microsoft and Amazon responded to cloud market competition concerns?
According to the CMA, both companies are taking steps to lower some of their fees in the cloud market.

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