MC1183298 – M365 Change Digest

One-line summary

Outlook Mobile's compose toolbar will soon let users customize action order and placement for improved email workflows; rollout starts December 2025 and completes by end of January 2026.

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Details

Summary

Outlook Mobile's compose toolbar will be customizable, allowing users to reorder actions for improved productivity. The feature rolls out globally from early December 2025 to January 2026, enabled by default for all users. No action is required, but updating helpdesk or documentation is recommended.

Body (from Message Center)

Updated December 4, 2025: We have updated the timeline. Thank you for your patience.

[Introduction]

We’re updating the compose toolbar in Outlook Mobile to give users more control over their email experience. This change allows users to customize the order and placement of toolbar actions when composing an email, helping streamline workflows and improve productivity.

[When this will happen:]

General Availability (Worldwide, GCC, GCC High, and DoD): Rollout will begin in early December 2025 and is expected to complete by end of January 2026 (previously early December 2025).

[How this affects your organization:]

Who is affected: All users of Outlook Mobile.
What will happen:
- Users will be able to customize the toolbar layout when composing emails.
- The feature will be available by default; no opt-in required.

[What you can do to prepare:]

No action is required at this time.
You may choose to notify helpdesk staff or update internal documentation to reflect this new customization capability.

[Compliance considerations:]

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

Raw JSON (for debugging)

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      "Summary": "Outlook Mobile\u0027s compose toolbar will be customizable, allowing users to reorder actions for improved productivity. The feature rolls out globally from early December 2025 to January 2026, enabled by default for all users. No action is required, but updating helpdesk or documentation is recommended."
    },
    "id": "MC1183298",
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    "last_modified": "2025-12-04T21:32:20Z",
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    "tags": [
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