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MC1183298 Stay informedUpdated messageFeature updateUser impact

Updated compose toolbar and actions in Outlook Mobile

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.
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Rollout

Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".

Schedule dates changed in the text

Date phrases in schedule sentences differ between the versions this installation saw
  • Seen 4 Dec 2025 end of January 2026

Read from date phrases in Microsoft's text, not from notice metadata. A changed phrase can be a moved rollout, a new milestone or just rewording; "What changed" below shows which.

What the notice says

Microsoft’s text, safely structured

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.

What changed

Between archive captures, newest first
    • Tags Feature update, User impact → Updated message, Feature update, User impact

    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 … Rollout will begin in early December 2025 and is expected to complete within the same timeframe.by end of January 2026 (previously early December 2025). How this affects your organization: Who is affected: All users of Outlook …

  2. · first version seen

No related evidence found in this installation's recent collection. This does not establish that no announcement exists.

Not confirmed here

What this page cannot tell you
  • Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.
ChangeIntel

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