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A UK Competition Appeal Tribunal has certified a collective opt-out lawsuit against Microsoft alleging it overcharged nearly 60,000 British businesses for Windows Server licences when run on rival cloud platforms.
The claim, brought by competition lawyer Dr Maria Luisa Stasi, seeks about £2.1 billion (roughly $2.8 billion) and contends Microsoft set higher wholesale prices for Windows Server on Amazon Web Services, Google Cloud and Alibaba Cloud than for equivalent usage on its own Azure service, making competitors comparatively more expensive.
The tribunal dismissed Microsoft’s challenge that the claim lacked a workable method for calculating losses and concluded the action “comfortably crosses” the threshold for a real prospect of success.
A Collective Proceedings Order will be published with opt-out details and timelines; Microsoft said it would appeal and denied any wrongdoing.
The ruling comes amid growing regulatory scrutiny of Microsoft’s cloud and licensing practices by the UK’s Competition and Markets Authority and probes in Europe, the US and elsewhere.
The decision keeps a major test of cloud licensing and competitive practices on track for trial and could lead to damages, settlements or changes to licensing terms if claimants prevail.







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