Microsoft will switch on Anthropic’s Claude by default for UK Copilot tenants on December 9

UK administrators who don't pick a setting will find Claude enabled, with data processed in the US and outside the EU Data Boundary Microsoft is about to flip a switch for UK businesses using Copilot. Starting December 9, Anthropic ’s Claude models will be enabled by default for UK Microsoft 365 Copilot tenants whose administrators have not already chosen a setting. Administrators can still turn it off. But silence counts as consent here, which makes December 9 a compliance deadline as much as a product update. The mechanics are simple. If a UK tenant’s admin has never touched the Claude setting, access will be on when the date arrives. Opting out remains possible at any time.

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