Microsoft Faces UK Class Action Over Cloud Computing Licensing
On April 22, 2026, the UK Competition Appeal Tribunal (CAT) certified a collective action against Microsoft, allowing the case to proceed to trial. The lawsuit, brought by digital markets regulation expert Maria Luisa Stasi, alleges that Microsoft abused its dominant position in the market to overcharge businesses and organisations using its Windows Server software on non-Microsoft public clouds.
The claim seeks approximately £2 billion in damages on behalf of around 59,000 businesses, and organisations. This development follows the UK Competition and Markets Authority’s announcement in March 2026 of a Strategic Market Status investigation into Microsoft’s software licensing practices in the cloud market.
Background of the Case
The collective action focuses on two aspects of Microsoft’s licensing practices. First, it addresses pricing abuse under the Service Provider License Agreement (SPLA), where Microsoft allegedly charges wholesale prices for Windows Server that are higher than those charged to Azure users. Second, it concerns restrictions that limit customer choice when using Microsoft software on rival cloud platforms.
Maria Luisa Stasi, who is leading the case, stated that Microsoft’s dominance in parts of the IT infrastructure stack enables it to impose terms that are difficult for business users to accept, particularly because the company limits choice for customers. She emphasized that these practices have had a real financial impact on both public and private organisations over the years.
Legal Proceedings and Next Steps
The CAT dismissed Microsoft’s arguments against certification and granted a Collective Proceedings Order on an opt-out basis. This means that the approximately 59,000 businesses and organisations included in the class are automatically part of the action unless they choose to opt out. The case is now set to proceed towards trial, marking an early step in the legal process.
In March 2026, the UK Competition and Markets Authority announced it would launch a Strategic Market Status investigation into Microsoft, specifically probing its software licensing practices in the cloud market. This regulatory scrutiny runs parallel to the class action lawsuit.
Context and Implications
The case highlights ongoing concerns about market dominance in the cloud computing industry and the potential for dominant firms to leverage their position in ways that may harm competition and customer choice. As cloud computing continues to grow as a critical infrastructure for businesses worldwide, regulatory and legal scrutiny of licensing practices remains intense.
For the businesses and organisations involved, the outcome of this case could lead to significant financial redress if the allegations are proven. It also contributes to the broader conversation about fair competition in digital markets and the regulation of major technology companies.
As of April 22, 2026, the case is moving forward in the UK legal system, with preparations for trial underway. The outcome will be closely watched by industry stakeholders, regulators, and other large technology firms operating in the cloud computing space.
Microsoft Faces UK Class Action Over Cloud Computing Licensing
On April 22, 2026, the UK Competition Appeal Tribunal (CAT) certified a collective action against Microsoft, allowing the case to proceed to trial. The lawsuit, brought by digital markets regulation expert Maria Luisa Stasi, alleges that Microsoft abused its dominant position in the market to overcharge businesses and organisations using its Windows Server software on non-Microsoft public clouds.
The claim seeks approximately £2 billion in damages on behalf of around 59,000 businesses and organisations. This development follows the UK Competition and Markets Authority’s announcement in March 2026 of a Strategic Market Status investigation into Microsoft’s software licensing practices in the cloud market.
Background of the Case
The collective action focuses on two aspects of Microsoft’s licensing practices. First, it addresses pricing abuse under the Service Provider License Agreement (SPLA), where Microsoft allegedly charges wholesale prices for Windows Server that are higher than those charged to Azure users. Second, it concerns restrictions that limit customer choice when using Microsoft software on rival cloud platforms.
Maria Luisa Stasi, who is leading the case, stated that Microsoft’s dominance in parts of the IT infrastructure stack enables it to impose terms that are difficult for business users to accept, particularly because the company limits choice for customers. She emphasized that these practices have had a real financial impact on both public and private organisations over the years.
Legal Proceedings and Next Steps
The CAT dismissed Microsoft’s arguments against certification and granted a Collective Proceedings Order on an opt-out basis. This means that the approximately 59,000 businesses and organisations included in the class are automatically part of the action unless they choose to opt out. The case is now set to proceed towards trial, marking an early step in the legal process.
In March 2026, the UK Competition and Markets Authority announced it would launch a Strategic Market Status investigation into Microsoft, specifically probing its software licensing practices in the cloud market. This regulatory scrutiny runs parallel to the class action lawsuit.
Context and Implications
The case highlights ongoing concerns about market dominance in the cloud computing industry and the potential for dominant firms to leverage their position in ways that may harm competition and customer choice. As cloud computing continues to grow as a critical infrastructure for businesses worldwide, regulatory and legal scrutiny of licensing practices remains intense.
For the businesses and organisations involved, the outcome of this case could lead to significant financial redress if the allegations are proven. It also contributes to the broader conversation about fair competition in digital markets and the regulation of major technology companies.
As of April 22, 2026, the case is moving forward in the UK legal system, with preparations for trial underway. The outcome will be closely watched by industry stakeholders, regulators, and other large technology firms operating in the cloud computing space.