Microsoft is currently facing a lawsuit from the UK Competition Appeals Tribunal (CAT) after it was alleged that the company is charging higher wholesale prices for Windows Server for customers using Amazon AWS, Google Cloud, or Alibaba Cloud. This makes Azure, Microsoft’s cloud services provider, cheaper than the competition as its competitors have to eventually pass on the increased costs to their clients, reports Reuters. Competition lawyer Maria Luisa Stasi filed the case at the Competition Appeal Tribunal in late 2025, representing nearly 60,000 businesses that used Microsoft software on competing cloud services, with her team suggesting that the claim is worth about USD 2.8 billion (or about GBP 2.1 billion).

The company argued that Stasi did not show a concrete way of computing for any alleged losses, so the case should be thrown out. However, the London tribunal certified the case, and it’s now proceeding to trial. Microsoft is planning to appeal the decision and told the publication, “We also dispute the underlying allegations by the class representative, and today’s decision makes no final determination on those claims.”

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