MC1191916 – M365 Change Digest

One-line summary

Teams notifications will soon show message previews for channels, mentions, and reactions on desktop and web, improving user awareness and prioritization.

Similar updates

Details

Summary

Microsoft Teams will add message previews to channel, mention, and reaction notifications on Windows, Mac, and web starting mid-December 2025. Users can disable previews via notification settings. No admin action or policy changes are needed; the feature activates with client updates.

Body (from Message Center)

[Introduction]

Microsoft Teams is improving the notification experience by adding message previews to more types of notifications, including channels, mentions, and reactions. This enhancement helps users quickly assess the importance of a notification without switching context, prioritize responses more effectively, and enjoy a consistent experience across platforms.

This message applies to Teams for Windows desktop, Teams for Mac desktop and Teams for the web.

Screenshot: @mention notification with message preview

user settings

[When this will happen:]

Targeted Release (Worldwide): Rollout begins mid-December 2025; expected to complete by mid-December 2025
General Availability (Worldwide): Rollout begins mid-January 2026; expected to complete by mid-January 2026
General Availability (GCC, GCC High, DoD): Rollout begins mid-January 2026; expected to complete by late January 2026

[How this affects your organization:]

Who is affected: All users of Microsoft Teams on Windows and Mac desktop clients and Teams on the web.
What will happen:
- Notifications for channels, mentions, and reactions will include a message preview, unless the message preview is disabled by users.
- Users can disable previews:
  - On Windows and Web: via Teams Notification Settings.
  - On Mac: via OS Notification Settings.
- No changes to existing admin policies; no policy updates required.

[What you can do to prepare:]

No admin action is required; the feature will be available automatically once users update to the supported Teams client build.
Consider notifying your users about this update and how they can manage notification settings.

[Compliance considerations:]

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

Raw JSON (for debugging)

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    "action_required_by": null,
    "ai_action_required_by": null,
    "ai_actions": [
      "Inform users about new notification previews",
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    "ai_model": "gpt-4.1",
    "ai_summary": "Teams notifications will soon show message previews for channels, mentions, and reactions on desktop and web, improving user awareness and prioritization.",
    "ai_topics": [
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    ],
    "category": "stayInformed",
    "details_map": {
      "Summary": "Microsoft Teams will add message previews to channel, mention, and reaction notifications on Windows, Mac, and web starting mid-December 2025. Users can disable previews via notification settings. No admin action or policy changes are needed; the feature activates with client updates."
    },
    "id": "MC1191916",
    "importance": 1,
    "is_major_change": false,
    "last_modified": "2025-12-03T21:38:39Z",
    "ms_products": [
      "Teams"
    ],
    "platforms": null,
    "roadmap_ids": [],
    "services": [
      "Microsoft Teams"
    ],
    "severity": "normal",
    "tags": [
      "New feature",
      "User impact"
    ],
    "title": "Message preview for channels, mentions, and reactions notifications"
  }
}