MC1129730 – M365 Change Digest

One-line summary

The new Microsoft Teams calendar experience will become default and the legacy calendar will be deprecated; toggle to switch calendars will be removed in January 2026.

Similar updates

Details

Summary

The new Microsoft Teams calendar experience will replace the legacy calendar, removing the toggle to switch back. This update rolls out worldwide from mid- to late January 2026, excluding GCC, GCCH, DoD, USSec, and USNat. No admin action is needed; inform users and update documentation accordingly.

Body (from Message Center)

Updated December 1, 2025: We have updated the timeline. After further review, we will not be rolling this out to GCC, GCCH, DoD, USSec, USNat during the timeline outlined below. We will communicate via Message center in dedicated posts when we are ready to proceed. Thank you for your patience.

We’re introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed.

When this will happen

General Availability (Worldwide): Mid-January 2026 to end of January 2026

How this affects your organization

Once this update is deployed, users accessing the Calendar app in Microsoft Teams will see the new calendar experience by default. The toggle to switch between the old and new calendar will be removed, and only the new Microsoft 365 calendar will be available. This change may impact users accustomed to the legacy calendar interface.

What you can do to prepare

No admin action is required. We recommend informing your users about the upcoming change and updating any internal documentation or training materials that reference the legacy calendar experience.

For more information about the new calendar experience, visit the Microsoft Teams documentation.

Compliance considerations

No compliance considerations identified, review as appropriate for your organization.

Raw JSON (for debugging)

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    "ai_action_required_by": "2026-01-15T00:00:00Z",
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    ],
    "ai_master_tags": [],
    "ai_model": "gpt-4.1",
    "ai_summary": "The new Microsoft Teams calendar experience will become default and the legacy calendar will be deprecated; toggle to switch calendars will be removed in January 2026.",
    "ai_topics": [
      "Teams",
      "Outlook",
      "Copilot",
      "Places"
    ],
    "category": "planForChange",
    "details_map": {
      "Summary": "The new Microsoft Teams calendar experience will replace the legacy calendar, removing the toggle to switch back. This update rolls out worldwide from mid- to late January 2026, excluding GCC, GCCH, DoD, USSec, and USNat. No admin action is needed; inform users and update documentation accordingly."
    },
    "id": "MC1129730",
    "importance": 5,
    "is_major_change": true,
    "last_modified": "2025-12-01T17:27:07Z",
    "ms_products": [
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    "platforms": null,
    "roadmap_ids": [],
    "services": [
      "Microsoft Teams"
    ],
    "severity": "normal",
    "tags": [
      "Updated message",
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    "title": "(Updated) Remove toggle for Calendar in Teams"
  }
}