Claude EU Data Boundary, Copilot Code and Frontier Expansion: M365 Changes

Tom Arbuthnot (Empowering.Cloud) and Rolf Troendle (ChangeCockpit) pick out the Microsoft 365 changes worth acting on ahead of Ignite: Claude coming into the EU Data Boundary with new default access from 9 December (MC1546438, MC1546435), Copilot Code for Frontier users (MC1519871), Frontier expanding to Teams, Outlook, OneDrive and SharePoint (MC1529472) and SMS and voice retiring for self-service password reset (MC1536049).

Summary

• Act before 9 December: review your Anthropic settings in EU, EFTA or UK tenants. Defaults change for tenants with no selection or the apps-only setting; UK tenants remain outside the EU Data Boundary.
• Act now: check who is in Frontier. They will start getting early Teams, Outlook, OneDrive and SharePoint features, and eligible Frontier users may get Copilot Code automatically if their spending policy allows new agents and services.
• Plan for February 2027: move users off SMS and voice for MFA and self-service password reset, or configure a third-party telephony provider.

Which Microsoft 365 changes need action this month?

Five changes need an admin decision or user communication. The rest are user experience changes your adoption team should know about.

What changes when Claude comes into the EU Data Boundary (MC1546438)?

From early December 2026, Claude processing moves inside the EU Data Boundary for eligible EU and EFTA tenants. On 9 December, default access changes in eligible EU, EFTA and UK tenants, but UK tenants stay outside the boundary.

Until early December, Claude models in Copilot are not covered by the EU Data Boundary processing commitment. Rolf calls the change "a kind of a small Christmas present", but tenants are treated differently:

Existing selections such as No users or Specific users and groups are respected, and Anthropic models with Data Retention have a separate setting. Because Multi-Geo tenants are excluded even with an EU home geo, Rolf suggests asking your Microsoft account manager.

Admin path: Microsoft 365 admin center → Copilot → Settings → View all → AI providers operating as Microsoft subprocessors

Which new Copilot models need usage-based billing (MC1519122)?

The newest models in Copilot Chat and Copilot in Word, Excel and PowerPoint, including GPT-6 Astra and Claude Fable 5.1, need usage-based billing (UBB). Users also need a Microsoft 365 Copilot licence, UBB enabled and allocated credits.

UBB is Microsoft's new name for consumption-based or pay-as-you-go billing. The rollout starts in Frontier in early November, with general availability expected from early to mid-December 2026 (MC1519122). The models stay visible even to users without UBB. Tom notes admins would rather not show features they haven't approved; Rolf counters that "a new feature is not a new feature if users can't find it."

Anthropic says zero data retention is available to eligible customers for Fable 5.1; check the terms that apply to your deployment.

How does Copilot Code affect Frontier users (MC1519871)?

Copilot Code is a new agentic coding tab in the Copilot app that lets non-developers build apps on Microsoft 365. Eligible Frontier users with a Copilot licence can get it automatically if their spending policy allows new agents and services.

Copilot Code is separate from GitHub Copilot, and Rolf corrects his earlier claim that it was based on Claude Code. Published apps run on the Microsoft-managed Copilot Managed Runtime; admins can optionally enable GitHub connectivity and local coding on PCs. If you want different access to Cowork and Code, review your spending policies (MC1519871).

What is changing in the Copilot app (MC1535647, MC1536062)?

Notebooks become Workspaces, Projects group chats and Cowork tasks, and the Word, Excel and PowerPoint agents are removed in favour of creating documents directly in Copilot Chat.

• Notebooks renamed Workspaces (MC1535647). Tom thinks the name fits, because a notebook is really a set of files for context. Tell existing Notebooks users the interface has changed.
• Projects organise chats and Cowork tasks. Rolf sees these as essential for keeping chat history in order.
• Word, Excel and PowerPoint agents removed (MC1536062). Users just ask Copilot Chat instead of @mentioning an agent. Existing agent conversations stay viewable, but creating or editing files needs a new chat.

What does the Frontier expansion mean for your users (MC1529472)?

Frontier now gives early access to previews in Teams, new Outlook for Windows, OneDrive and SharePoint, not just Copilot. Users you added for early Copilot features will now get early features across those workloads too.

Frontier is an optional public-preview programme, separate from Standard and Deferred release; Deferred follows Standard by about 30 days for eligible major updates. Targeted Release retires in January 2027, and its users are not automatically enrolled in Frontier (MC1529472). Tom thinks the change makes sense, because so many Copilot features depend on Teams, OneDrive and Outlook, but check your Frontier users are happy with the faster pace. Rolf notes the rollout starts within days of recording.

When do SMS and voice stop working for self-service password reset (MC1536049)?

Microsoft-provided SMS and voice are retiring for self-service password reset (SSPR). Make sure users have other eligible recovery methods, or configure a third-party telephony provider, before the transition ends.

• Sign-in retirement starts: 1 February 2027 for most users; 1 July 2027 for Global Administrators and external users. These are phased start dates, not universal SSPR cutoffs.
• SSPR grace period: existing SMS and voice registrations keep working for SSPR for 50 days after the sign-in retirement reaches your tenant (MC1536049).
• Passkeys are not enough: passkeys alone do not satisfy SSPR requirements.
• Reminder post: MC1540327 targets tenants with users relying only on SMS or voice where passkeys aren't supported.
• Third-party telephony: you can now add your own SMS and voice provider (MC1519855).

Admin path: Microsoft Entra admin center → Entra ID → Authentication methods → Policies

What else changed this month?

Four smaller changes affect Copilot Chat limits, connectors, Teams meetings and search. None needs urgent action, but your adoption team should know about them.

• Copilot Chat limits for unlicensed users (MC1536163). The fair use policy extends from image generation to Copilot Chat. Limits vary, admins can't view or adjust them, and users are told in-product. Tom finds the lack of published limits frustrating.
• Self-serve Copilot connectors deferred (MC1459140). The Jira Cloud and Confluence Cloud rollout is not proceeding for now. Admin-configured connectors remain under Microsoft 365 admin center → Copilot → Connectors. Tom expects more at Ignite.
• Teams meetings: two presenters can share at once, with general availability from early to mid-December 2026 (MC1528014). Organisers can also require Conditional Access authentication context, such as device compliance or phishing-resistant MFA; preview from November 2026, general availability expected January 2027 (MC1532256). Admin path: Microsoft Entra admin center → Entra ID → Conditional Access → Authentication contexts
• SharePoint and OneDrive search aligns with Copilot Search (MC1540513). Some AI features depend on licensing; Rolf says base search is included for unlicensed users.

Frequently asked questions

Will UK tenants have Claude processed inside the EU Data Boundary?

No. UK tenants are outside the EU Data Boundary; the default access change depends on their existing Anthropic setting (MC1546435).

Are Multi-Geo tenants covered by the Claude EU Data Boundary change?

No. Multi-Geo tenants are out of scope even with an EU home geo, so check with your Microsoft account manager (MC1546438).

Will Copilot Code appear for my users automatically?

Possibly. Eligible Frontier users receive Code automatically if their spending policy allows new agents and services (MC1519871).

Is Targeted Release being retired?

Yes, in January 2027. Targeted Release users are not automatically enrolled in Frontier (MC1529472).

Empowering.Cloud helps you keep up with the Microsoft 365, Teams and Copilot changes that matter. Explore more on Empowering.Cloud.

Insights summarised by AI from the episode transcript, reviewed by Empowering.Cloud team.