Microsoft 365 Copilot Claude UK tenants default setting, Digi Mart USA News (United Kingdom): Microsoft will turn on Anthropic’s Claude models in Microsoft 365 Copilot by default for organizations in the UK on December 9, according to Message Center post MC1546435. The change applies to every UK tenant whose administrators have not yet selected a setting, meaning that leaving the setting untouched results in opting in.
Microsoft explains on its Claude documentation page that Claude models in Copilot, Researcher, Copilot Studio and the Power Platform are currently excluded from the EU Data Boundary, its commitment to process customer data inside the EU. For customers in the EU, the EFTA and the UK, the setting has therefore defaulted to No users.
In other commercial regions, Claude is already on by default, and The Register reports that Anthropic processes the data in the United States.
Because the UK is not part of the EU Data Boundary, Microsoft is dropping that exception there. It is also retiring the option to allow Claude only in Copilot in the Microsoft 365 apps, so tenants without their own selection will move to all users on December 9. UK administrators who want Claude to stay disabled or limited must select No users, or specific users and groups, before that date.
The setting is found in the Microsoft 365 admin center under Copilot, Settings and AI providers operating as Microsoft subprocessors, and only AI administrators and global administrators can change it. According to Microsoft, organizations in the EU that previously opted in under Anthropic’s separate commercial terms will need to opt in again.
Microsoft handles certain Anthropic models with Data Retention, such as Claude Fable 5 and Claude Mythos 5, separately, and Anthropic’s own terms apply to them instead of Microsoft’s data protection commitments. Anthropic keeps most inputs and outputs for up to 30 days, and admins must still enable these models themselves.
Neither Microsoft’s page nor the Message Center post mentions Microsoft 365 Personal or Family, since both cover only managed work accounts.
