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In a move that has sent shockwaves through the tech industry, Microsoft has been hit with a class action lawsuit Tuesday, accusing the company of overcharging U.K. businesses for licenses to its Windows Server software. The case, which could total over £1 billion ($1.3 billion), claims that Microsoft’s pricing structure unfairly discriminates against customers using non-Microsoft cloud services, including Amazon, Google, and Alibaba.

The Core of the Allegations

The lawsuit, filed by regulatory expert Maria Luisa Stasi, accuses Microsoft of penalizing U.K. businesses that rely on platforms like Amazon’s AWS, Google Cloud, or Alibaba Cloud by charging them higher licensing fees for Windows Server compared to customers using Microsoft’s own Azure service.

“Microsoft is punishing U.K. businesses by forcing them to pay inflated prices for Windows Server simply because they aren’t using Azure,” said Stasi, who heads law and policy for digital markets at the human rights organization Article 19. "This isn’t just a pricing issue—it’s a blatant attempt to corner the cloud computing market and push customers into Microsoft's ecosystem."

A Competitive Stifling Strategy?

According to Stasi, this practice isn’t just about higher prices; it’s a strategic move designed to drive U.K. businesses away from competitors. Microsoft, which already holds a dominant market share of 70 to 80% in desktop operating systems, is allegedly leveraging its position in the server operating system market to coerce businesses into using its cloud service, Azure, thereby restricting competition.

The claim mirrors a similar action that Alexander Wolfson, a former barrister with the Crown Prosecution Service, announced in September. Wolfson is also working on behalf of U.K. organizations and businesses affected by Microsoft’s alleged overpricing practices.

Collective Action and Potential Impact

Stasi’s “opt-out” collective action opens the door for any U.K. business or organization that purchased Windows Server licenses through Amazon AWS, Google Cloud, or Alibaba Cloud to join the lawsuit. If successful, the lawsuit could have far-reaching consequences, not only for Microsoft but for the wider cloud computing sector.

The Competition and Markets Authority (CMA) in the U.K. has already raised concerns about Microsoft’s practices, with findings in September 2023 showing that Microsoft commands a substantial market share in the desktop operating system space. The CMA also recently urged a review of the cloud services market after a study revealed that customers face significant barriers when trying to switch providers.

A Long-Standing Debate

This is not the first time Microsoft’s licensing practices have faced scrutiny. In addition to the ongoing class action, the company is locked in a separate, multi-year legal battle with software reseller ValueLicensing. The reseller claims Microsoft has stifled the secondary market for pre-owned software licenses, leading to a separate £270 million lawsuit in the U.K. and European Economic Area.

As the legal saga unfolds, all eyes will be on Microsoft and the impact these lawsuits could have on the broader cloud computing and software industries.

Microsoft has not yet responded to requests for comment, and details regarding Stasi’s legal counsel are still pending.