Microsoft to face UK class action over cloud computing licencing

April 23, 2026

```json { "title": "Microsoft Faces £2.1 Billion UK Cloud Licensing Class Action", "metaDescription": "The UK Competition Appeal Tribunal has certified a £2.1 billion opt-out class action against Microsoft over cloud computing licensing practices affecting 59,000 businesses.", "content": "<h2>UK Tribunal Clears £2.1 Billion Cloud Licensing Class Action Against Microsoft</h2>The UK Competition Appeal Tribunal (CAT) has certified a £2.1 billion ($2.8 billion) opt-out class action lawsuit against Microsoft, clearing the way for a landmark legal battle over cloud computing licensing practices that could affect approximately 59,000 UK businesses and organisations. The Collective Proceedings Order (CPO) was granted on 21 April 2026, in the case formally known as Stasi v Microsoft (case No. 1696/7/7/24), naming Microsoft Corporation, Microsoft Limited, and Microsoft Ireland Operations Limited as defendants.The case, led by law firm Scott+Scott on behalf of lead claimant Dr Maria Luisa Stasi, a digital markets regulation expert and competition lawyer, alleges that Microsoft abused its dominant position in the software market by charging higher wholesale prices for Windows Server to businesses using rival cloud platforms — including AWS, Google Cloud, and Alibaba Cloud — compared to users of its own Azure platform. The ruling arrives amid a widening wave of regulatory scrutiny of Microsoft's cloud and software ecosystem in the UK and internationally.<h2>What the Class Action Alleges</h2>At the centre of the lawsuit is the claim that Microsoft's pricing structure under its Service Provider License Agreements (SPLAs) effectively made Azure artificially cheaper than rival cloud platforms. According to the allegations, Microsoft charged higher wholesale prices for Windows Server to third-party cloud providers such as AWS, Google Cloud, and Alibaba Cloud, while its own Azure platform operated without the same cost burden — a practice the claimants argue distorts competition in the cloud market.The claim also involves what has been described as an 'abuse of re-licensing.' Microsoft is alleged to have allowed organisations with existing on-premise Windows Server licences to deploy on Azure without incurring re-licensing fees — a right that was not extended to customers using rival cloud platforms. Critics argue this gave Azure a structural commercial advantage that rival platforms could not replicate, regardless of their own pricing or service quality.The CAT stated in its judgment that the claim 'comfortably passes' the reasonable prospect of success threshold — a notable finding given that Microsoft had argued the case should be thrown out. Microsoft's objection centred on the claim that Dr Stasi's legal team had failed to set out a workable method for calculating alleged losses. The Tribunal dismissed that objection, allowing the case to proceed on an opt-out basis. This means that every eligible UK business is automatically included in the claim unless they actively choose to withdraw.The lawsuit was originally filed in December 2024. It covers a claim valued at up to £2.1 billion, with approximately 59,000 businesses and organisations potentially eligible for compensation.<h2>Microsoft Plans to Appeal — While Regulatory Pressure Mounts</h2>Microsoft has signalled it will not accept the CAT's certification ruling without a fight. A company spokesperson confirmed the company intends to appeal, arguing the Tribunal failed to apply recent UK Supreme Court precedent on class action certifications.The CAT's ruling lands against a backdrop of intensifying regulatory action. On 31 March 2026, the UK's Competition and Markets Authority (CMA) announced it would open a Strategic Market Status (SMS) investigation into Microsoft's broader business software ecosystem, expected to begin in May 2026. The investigation covers a wide range of Microsoft's enterprise products — including Windows, Word, Excel, Teams, and Copilot — which are used by hundreds of thousands of UK businesses and public sector organisations every day.An SMS designation would give the CMA significant new powers, including the ability to impose conduct requirements and financial penalties if Microsoft is found to hold a dominant position in the relevant markets. The March 2026 announcement also included voluntary commitments secured from both Microsoft and Amazon Web Services on cloud egress fees and interoperability — a measure the CMA described as part of a broader package to address competition concerns in the cloud market.This is not the first time UK regulators have raised concerns about Microsoft's licensing model. In July 2025, a CMA inquiry group concluded that Microsoft's licensing practices were materially disadvantaging AWS and Google in the UK cloud services market — findings that now form part of the regulatory context surrounding the current class action.<h2>A Pattern of Global Scrutiny</h2>The UK proceedings are part of a broader international pattern of legal and regulatory pressure on Microsoft's cloud and software licensing practices. In 2024, Microsoft reached a settlement with CISPE, the EU-based cloud vendor group, agreeing to a payout and commitments to change certain licensing practices. Separately, the US Federal Trade Commission is examining whether Microsoft's cloud market conduct crosses antitrust lines, and Japanese antitrust authorities have opened their own investigation into potential violations of anti-monopoly laws.Microsoft is also separately appealing a CAT ruling in a case brought by software reseller ValueLicensing, which concerns secondhand software sales — underscoring the range of legal challenges the company is navigating in the UK alone.Microsoft has consistently characterised its business model as pro-competitive, arguing that its vertically integrated approach — licensing Windows Server both to Azure and to rival cloud platforms — supports, rather than undermines, the broader cloud market. The company has maintained that it disputes the underlying allegations in the Stasi case.<h2>Expert Reactions</h2>Dr Maria Luisa Stasi, the lead claimant and digital markets regulation expert, welcomed the Tribunal's decision. "Today's ruling is an important moment for the thousands of organizations impacted by Microsoft's conduct and in ensuring that a critical sector of the economy is innovative and open," she said.James Hain-Cole, a partner at Scott+Scott, the law firm leading the case, expressed satisfaction with both the outcome and its scope. "We are very pleased with the Tribunal's decision, including its confirmation that Dr Stasi's action should proceed on an opt-out basis, as sought in her application," he said.Microsoft's response was measured but firm. A company spokesperson stated: "We will pursue an appeal of the Tribunal's decision because it failed to follow recent precedent from the Supreme Court on class action certifications." The spokesperson also emphasised: "We also dispute the underlying allegations by the class representative, and today's decision makes no final determination on those claims."On the CMA's parallel SMS investigation, Sarah Cardell, CEO of the UK Competition and Markets Authority, set out the regulator's rationale. "An SMS designation would enable us to tackle remaining concerns around Microsoft's licensing practices in cloud and would also enable us to ensure a level playing field as AI is rapidly embedded into everyday business software tools," she said.Brad Smith, President of Microsoft, indicated the company's intention to cooperate with the CMA process. "We are committed to working quickly and constructively to address these issues, including by providing all the information the CMA needs to move forward with its reviews," he said.Mark Boost, CEO of cloud provider Civo, offered a broader industry perspective on the significance of the proceedings. "Ensuring a level playing field for all providers is essential to fostering innovation, expanding choice, and delivering the best outcomes for customers," he said.<h2>What Happens Next</h2>The certification of the class action as a Collective Proceedings Order means the case now moves toward trial, though Microsoft's stated intention to appeal the CAT's certification ruling means the legal timeline remains uncertain. An appeal could delay substantive proceedings, but the opt-out structure of the case means affected UK businesses remain included by default unless they choose otherwise.The CMA's SMS investigation into Microsoft's business software ecosystem is expected to formally begin in May 2026. If the CMA ultimately designates Microsoft as holding Strategic Market Status, it would gain the authority to impose binding conduct requirements — potentially reshaping how Microsoft licenses its software to businesses and cloud providers operating in the UK.The intersection of the class action and the ongoing regulatory investigations means Microsoft faces pressure on multiple fronts simultaneously. The outcomes of these proceedings — whether through court judgments, negotiated commitments, or regulatory designations — could have significant implications for how enterprise cloud software is licensed and priced, not only in the UK but potentially across other jurisdictions watching closely.For affected UK businesses, the opt-out mechanism means no immediate action is required to remain part of the claim. As the case moves forward, the approximately 59,000 organisations within scope will be watching closely to see whether the Tribunal's assessment that the case 'comfortably passes' the threshold of reasonable prospects translates into compensation at trial.For more tech news, visit our <a href='/news'>news section</a>.<h2>Why This Matters for Your Business and Productivity</h2>Cloud software licensing disputes of this scale are not abstract legal proceedings — they shape the tools, costs, and competitive choices available to businesses of every size. Whether you rely on Microsoft's ecosystem for daily productivity or depend on alternative cloud platforms, the outcomes of cases like Stasi v Microsoft and the CMA's SMS investigation will influence the pricing and accessibility of the software infrastructure that underpins modern work. Staying informed about the regulatory and legal forces reshaping enterprise technology is part of making smarter decisions about the tools and platforms that power your productivity. Join the <a href='/#waitlist'>Moccet waitlist</a> to stay ahead of the curve.", "excerpt": "The UK Competition Appeal Tribunal has certified a £2.1 billion opt-out class action against Microsoft, alleging the company's cloud licensing practices artificially disadvantaged rivals including AWS and Google Cloud. The ruling affects approximately 59,000 UK businesses and arrives as the CMA prepares to launch a separate Strategic Market Status investigation into Microsoft's software ecosystem. Microsoft has said it plans to appeal the certification decision.", "keywords": ["Microsoft cloud licensing", "UK class action", "Competition Appeal Tribunal", "Windows Server licensing", "CMA investigation"], "slug": "microsoft-uk-cloud-licensing-class-action-2026" } ```

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