MC1194615 – M365 Change Digest

One-line summary

Copilot Chat will soon be available in Excel for locally stored modern workbooks, matching functionality for files in SharePoint and OneDrive; rollout starts mid-December 2025.

Similar updates

Details

Summary

Microsoft 365 subscribers will be able to use Copilot Chat in locally stored Excel modern workbooks starting mid-December 2025, with rollout completing by January 2026. This feature is enabled by default and aligns functionality with workbooks stored in SharePoint or OneDrive.

Body (from Message Center)

We’re enabling Microsoft 365 subscribers to use Copilot Chat when working in Microsoft Excel modern workbooks (.xlsx, .xlsb, .xlsm, .ods, .xltx, .xltm, and .xlam files) stored locally. This brings parity with workbooks stored in SharePoint or OneDrive, allowing users to query Copilot Chat regardless of storage location.

[When this will happen]

General Availability (Worldwide): Rollout will begin in mid-December 2025 and is expected to complete in January 2026.

How this affects your organization:

Who is affected: All Microsoft 365 subscribers using Excel modern workbooks stored locally.

What will happen:

Microsoft 365 subscribers will be able to query Copilot Chat when opening and working in locally stored Excel modern workbooks.
This feature is enabled by default; no admin action is required.
There is no impact to existing workflows for workbooks stored in SharePoint or OneDrive.

[What you can do to prepare]

All locally stored Modern Excel workbooks are blocked today from querying Copilot Chat. We are enabling M365 subscribers who open these workbooks and query Copilot Chat. See Manage Microsoft 365 Copilot Chat to manage that chat experience.

Learn more:

[Compliance considerations]

No compliance considerations identified. Review as appropriate for your organization.

Raw JSON (for debugging)

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    "ai_summary": "Copilot Chat will soon be available in Excel for locally stored modern workbooks, matching functionality for files in SharePoint and OneDrive; rollout starts mid-December 2025.",
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    "category": "stayInformed",
    "details_map": {
      "Summary": "Microsoft 365 subscribers will be able to use Copilot Chat in locally stored Excel modern workbooks starting mid-December 2025, with rollout completing by January 2026. This feature is enabled by default and aligns functionality with workbooks stored in SharePoint or OneDrive."
    },
    "id": "MC1194615",
    "importance": 1,
    "is_major_change": false,
    "last_modified": "2025-12-12T01:05:22Z",
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    "services": [
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    "severity": "normal",
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    "title": "Microsoft Excel: Enabling M365 subscribers to use Copilot Chat in locally stored modern workbooks"
  }
}