MC1092458 – M365 Change Digest

One-line summary

New Message Trace in Exchange Online is now generally available; legacy Message Trace UI and cmdlets will be deprecated starting September 1, 2025. Update scripts to use new cmdlets before then.

Similar updates

Details

RoadmapIds

495489

Summary

The new Message Trace in Exchange Online is generally available, replacing legacy cmdlets and UI starting September 1, 2025. The legacy tools will be supported in parallel for months, with full deprecation by March 18, 2026. Admins should update scripts and begin using the new experience.

Platforms

Web

Body (from Message Center)

Updated December 19, 2025: The tentative timeline for Public Preview of the new Message Trace support on Graph API has been delayed from December 2025 to now January 2026.

This does not impact the deprecation timeline for the legacy Message Trace cmdlets. The legacy Message Trace cmdlets (Get-MessageTrace, Get-MessageTraceDetail) were deprecated starting back in September 1st 2025.

We are excited to announce the General Availability of the new Message Trace in the Microsoft Exchange admin center (EAC) in Microsoft Exchange Online. This new experience, previously in Public Preview, offers improved performance, modern design, and enhanced feature parity. Admins can access it via Exchange admin center > Mail flow > Message Trace.

The GA release is associated with Microsoft 365 Roadmap ID 495489.

[When this will happen:]

Retirement of legacy Message Trace begins September 1, 2025.
General Availability (Worldwide): We will begin rolling out mid-June and expect to complete by late July.

[How this will affect your organization:]

Like in Public Preview, the new Message Trace UX in EAC will be available by default and Microsoft PowerShell cmdlets (Get-MessageTraceV2, Get-MessageTraceDetailV2) will be available.
The legacy Message Trace experience and cmdlets (Get-MessageTrace, Get-MessageTraceDetail) will remain available in parallel for several months to support the transition.
Starting September 1, 2025, the following will begin deprecating:
- Legacy Message Trace UI in EAC.
- Legacy cmdlets (Get-MessageTrace, Get-MessageTraceDetail).
Starting March 18th, 2026, Reporting Web Service support for Message Trace data will begin deprecating.

[What you need to do to prepare:]

This GA rollout and retirement will happen automatically by the specified dates with no admin action required before the rollout. Review your current configuration to assess the impact on your organization. You may want to notify your admins and/or users about this change and update internal documentation.

Begin using the new Message Trace experience in the Exchange admin center.
Update any automation or scripts using legacy cmdlets to use the new versions by August 31, 2025.
If you rely on the Reporting Web Service for Message Trace data, migrate to the new PowerShell cmdlets by March 18, 2026.
To provide feedback on the new Message Trace, use Exchange admin center > Give Feedback.

Learn more about the GA rollout: Announcing General Availability (GA) of the New Message Trace in Exchange Online | Microsoft Community Hub (documentation will be linked to this blog before rollout)

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    "ai_summary": "New Message Trace in Exchange Online is now generally available; legacy Message Trace UI and cmdlets will be deprecated starting September 1, 2025. Update scripts to use new cmdlets before then.",
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    "category": "planForChange",
    "details_map": {
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      "Summary": "The new Message Trace in Exchange Online is generally available, replacing legacy cmdlets and UI starting September 1, 2025. The legacy tools will be supported in parallel for months, with full deprecation by March 18, 2026. Admins should update scripts and begin using the new experience."
    },
    "id": "MC1092458",
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    "last_modified": "2025-12-19T17:52:52Z",
    "ms_products": [
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    "severity": "normal",
    "tags": [
      "Updated message",
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    "title": "(Updated) Microsoft Exchange Online: New Message Trace will be GA; legacy Message Trace will retire"
  }
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