Cloud Computing
Microsoft must face a mass lawsuit in the UK alleging it overcharged thousands of businesses for using its Windows Server software on rival cloud platforms, after a London tribunal allowed the case to proceed toward trial.
The claim, brought by competition lawyer Maria Luisa Stasi, represents nearly 60,000 businesses that run Windows Server on cloud services operated by competitors such as Amazon Web Services, Google Cloud and Alibaba Cloud. The lawsuit is estimated to be worth up to £2.1 billion ($2.8 billion).
At the heart of the case is Microsoft’s licensing model. The claim alleges that Microsoft charges higher wholesale prices for Windows Server when it is deployed on rival clouds, compared to its own Microsoft Azure. According to the plaintiffs, these higher costs are passed on to customers, effectively making Azure a more economically attractive option and disadvantaging competing providers.
Microsoft had sought to have the case dismissed, arguing that the claim did not present a clear or workable method to calculate alleged damages. However, the UK’s Competition Appeal Tribunal rejected that argument at this stage, allowing the case to move forward—an early procedural step before a full trial.
The company has defended its vertically integrated model, stating that offering Windows Server both as a licensed product and as part of Azure can enhance competition and customer choice.
The lawsuit comes amid increasing regulatory scrutiny of cloud market practices globally. Authorities in the UK, Europe, and the United States are examining whether large cloud providers are using software licensing and ecosystem advantages to limit competition.
In the UK, the Competition and Markets Authority has previously raised concerns about Microsoft’s licensing practices, stating that they may “materially disadvantage” rival cloud providers. The regulator has since launched further investigations into the company’s conduct in the cloud infrastructure market.
The case adds to growing legal and regulatory pressure on major cloud providers as competition intensifies in the multibillion-dollar cloud computing industry.
The claim, brought by competition lawyer Maria Luisa Stasi, represents nearly 60,000 businesses that run Windows Server on cloud services operated by competitors such as Amazon Web Services, Google Cloud and Alibaba Cloud. The lawsuit is estimated to be worth up to £2.1 billion ($2.8 billion).
At the heart of the case is Microsoft’s licensing model. The claim alleges that Microsoft charges higher wholesale prices for Windows Server when it is deployed on rival clouds, compared to its own Microsoft Azure. According to the plaintiffs, these higher costs are passed on to customers, effectively making Azure a more economically attractive option and disadvantaging competing providers.
Microsoft had sought to have the case dismissed, arguing that the claim did not present a clear or workable method to calculate alleged damages. However, the UK’s Competition Appeal Tribunal rejected that argument at this stage, allowing the case to move forward—an early procedural step before a full trial.
The company has defended its vertically integrated model, stating that offering Windows Server both as a licensed product and as part of Azure can enhance competition and customer choice.
The lawsuit comes amid increasing regulatory scrutiny of cloud market practices globally. Authorities in the UK, Europe, and the United States are examining whether large cloud providers are using software licensing and ecosystem advantages to limit competition.
In the UK, the Competition and Markets Authority has previously raised concerns about Microsoft’s licensing practices, stating that they may “materially disadvantage” rival cloud providers. The regulator has since launched further investigations into the company’s conduct in the cloud infrastructure market.
The case adds to growing legal and regulatory pressure on major cloud providers as competition intensifies in the multibillion-dollar cloud computing industry.
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