The team pushing a £2 billion legal claim accusing Microsoft of overcharging businesses that use its software on rival clouds has called for further participants ahead of its first hearing in December.

The case in the UK's Competition Appeal Tribunal (CAT) centers on the cost – sometimes as much as four times as high – of running Windows Server on Google, AWS, or Alibaba clouds.

Microsoft: So what if it costs 4X as much to run Windows Server in AWS, Alibaba, and Google?

Filed in December 2024, the case is being spearheaded by digital markets regulation expert Dr Maria Luisa Stasi. It was given added impetus by the Competition and Markets Authority's (CMA) final findings in July that Microsoft's licensing policies disadvantaged customers using its three main rivals.

Among other findings

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