ChangeIntelIT change radar
Public mode

No tenant, Graph, or device access. Every item links to its source. What this means

Some sources or documents need attention: 253/255 feeds/APIs · 417/444 docs · checked 14:26 UTC Customize Public modeDiscuss ChangeIntel on Discord
MC1492954 Plan for changeMajor changeUser impactAdmin impactRetirement

Microsoft Outlook: Themes by Copilot retirement

Exchange OnlineMicrosoft 365 admin center

Versions captured by this deployment. Earlier versions and notices may be missing; first observed is not first published.

Action date

Microsoft tags this a retirement but gives no action date in the notice metadata. Any date is in the text below.

Microsoft's start date
9 Oct 2026
Last changed by Microsoft
9 Oct 2026
First seen here
19 Oct 2026
Versions seen
1

What the notice says

Microsoft's text, with its sections, lists and tables; source markup removed

What and why

We are retiring Themes by Copilot in Microsoft Outlook. Themes by Copilot currently allows users with a Copilot license to create and apply a Copilot-generated theme in Settings. As part of this change, Themes by Copilot will be removed from Settings, and users will no longer be able to select or return to a Theme by Copilot after changing to a different theme.

Rollout schedule

  • General Availability (Worldwide): Retirement begins in mid-October 2026 and is expected to complete by late October 2026.

Impact on your organization

Who is affected

  • Users with a Copilot license.

Platforms and services

  • New Outlook for Windows
  • Outlook for Android
  • Outlook for iOS
  • Outlook for Mac
  • Outlook on the web

What will happen

  • Themes by Copilot will be removed from Settings. Users who are currently using a Theme by Copilot will retain their current theme until they change it.
  • Themes by Copilot configured to automatically refresh will remain applied but will stop refreshing. Users will retain the current theme imagery until they change their theme.
  • Users can change from their existing Theme by Copilot to a non-Copilot theme but cannot return to a Theme by Copilot after doing so.

Action required and recommendations

No action is required.

What changed

Between the versions this installation saw, newest first

This installation has seen one version of this notice, first on 19 Oct 2026. Later changes will show here.

Linked documentation

Microsoft pages the notice links to

The notice links to no Microsoft Learn or Support page that this installation reads.

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.
  • Versions before 19 Oct 2026: this installation first saw the notice after Microsoft posted it.
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 19 Oct 14:26 UTC · 253 of 255 readable · 252 fully read · documentation 417/444 current

No accounts or analytics; your preferences stay in your browser. Information, not advice. ChangeIntel is an independent tool and is not affiliated with or endorsed by Microsoft, Apple, Google, Broadcom (VMware), Jamf, Oracle, Mozilla, or any other vendor it covers. Product names are trademarks of their owners. Built by Evotec.