A major legal claim against Microsoft has cleared an early hurdle in the UK courts, and it could have significant implications for thousands of businesses.
The case, worth up to £2.1 billion, centres on how Microsoft licenses its Windows Server software in the cloud. And while it’s still at an early stage, the tribunal’s decision means the claim can now move forward towards trial.
So what’s actually being alleged, and who could be affected?
What is the Microsoft cloud licence claim about?
The claim focuses on how businesses are charged to run Windows Server software on cloud platforms.
At the centre of the case is an argument that Microsoft made it more expensive to use its software on rival cloud services such as Amazon Web Services, Google Cloud and Alibaba Cloud. According to the claim, Microsoft charges higher licensing fees when Windows Server is used on these competing platforms, compared to its own cloud service, Azure.
The result, it’s argued, is that:
- Businesses face higher costs when using non
- Microsoft cloud providers
- Competing cloud platforms are put at a disadvantage
- Microsoft’s own cloud offering becomes artificially more attractive.
Microsoft disputes these allegations and says its business model supports competition.
Why the case has been allowed to move forward
The decision comes from the Competition Appeal Tribunal, which handles competition-related group claims in the UK. The application was sought on an opt-out basis.
At this stage, the tribunal has “certified” the case. That means it has accepted that:
- The claim is suitable to be heard as a collective action
- There is a realistic basis for the case to proceed
- The issues raised should be tested at trial.
This is an early but important step. It doesn’t determine liability, but it does allow the case to move into the next phase. Microsoft has said it plans to appeal the decision.
Who could be affected?
According to reports, the claim is being brought on behalf of around 60,000 UK businesses. These are organisations that:
- Use Windows Server software
- Run that software on non-Microsoft cloud platforms
- May have paid higher licensing costs as a result.
If the claim succeeds, affected businesses could be entitled to compensation reflecting any overcharges.
What happens next?
Now that the claim has been certified, the case will move towards trial. That process is likely to involve:
- Detailed economic analysis of pricing and competition
- Examination of Microsoft’s licensing practices
- Arguments from both sides on whether businesses were overcharged.
These cases can take time, particularly at this scale. Any appeal of the certification decision is also likely to cause delays.
How this fits into the bigger picture on group claims
The UK has seen a steady rise in collective actions, particularly in areas like technology and competition.
These cases are designed to address situations where:
- Large numbers of businesses or consumers may have been affected
- Individual claims would be difficult or uneconomical to bring
- The issue relates to how a market operates as a whole.
They also play an important role in holding large organisations to account where there are allegations of unfair practices.
While this particular case focuses on businesses, it reflects a wider trend: large-scale legal actions being used to challenge how major markets operate — from cloud computing to digital platforms and everyday consumer services.
That same approach underpins many of the consumer claims we track on Join the Claim.
From app store pricing to online marketplaces and subscription services, similar competition issues can affect millions of individuals, often without them realising it. If you use digital platforms, pay for subscriptions, or buy products online, these cases may be more relevant to you than they first appear.
You can explore live and potential consumer claims on Join the Claim to see what’s being investigated, what it means, and whether you might be affected.
