Microsoft 365 Copilot to Enable Claude Models for UK Tenants on December 9

• •Claude models will be enabled by default for UK Microsoft 365 tenants on December 9, 2026.
• •EU organizations will remain excluded from this change until they opt in.
• •Admins must act before December 9 to disable or limit access to Claude models.

Microsoft will enable Anthropic's Claude models by default for UK organizations using Microsoft 365 Copilot starting December 9, 2026. This change affects all UK tenants who have not made a specific selection regarding the use of Claude models. In contrast, organizations in the EU will continue to have Claude models disabled by default until an admin opts in. The decision to enable Claude models in the UK is due to the country's exclusion from the EU Data Boundary, allowing Microsoft to process data without the same restrictions. Admins who wish to disable or limit access to Claude must make their selections before the deadline. The change aims to simplify admin controls by retiring the option to restrict Claude's use to only Microsoft 365 apps. Microsoft assures that Claude models are covered by its enterprise data protection commitments, although separate terms apply to models with data retention features.