The change appears in Microsoft 365 Message Center notice MC1492954. A copy of that notice in the Message Center archive says Themes by Copilot in Microsoft Outlook will be retired worldwide from mid- to late October 2026. Microsoft says no action is required from administrators. That doesn't mean nobody will notice, so here is what changes, who is affected and what you can still decide.
What's being retired
Themes by Copilot let licensed users ask Copilot to make a personalized Outlook theme. Microsoft's support page describes the Windows and web steps: open Settings > General > Appearance, pick the Custom Theme tile under Themes by Copilot, choose a topic, style and refresh cadence, and click Create. The theme is applied automatically, and Outlook may change your accent color to match it. On iOS and Android, the same choices sit under Display & Appearance in Settings.
The feature launched about two years ago. Microsoft's Tech Community blog said these AI-powered themes are accessible to all users with a Copilot Pro consumer subscription and business accounts with Copilot enabled, starting today, November 7th, which was November 7, 2024. Microsoft also called it the first instance of dynamic AI-generated theming in productivity applications. At launch, Thurrott reported that users can use a location or weather type as a starting point, then select an art style. When choosing a location, Outlook users can either pick up their own location or choose among over 100 curated destinations. How-To Geek noted that you could make a theme dynamic by choosing whether it updates every few hours, every day, every week, or every month.
That refresh option is the part that changes most for current users.
Section summary: This retires a cosmetic Copilot add-on that launched in November 2024. It doesn't touch Copilot's drafting, summarizing or other Outlook features.
Who is affected, and on which apps
The notice says it affects users with a Copilot license on these apps:
| Affected client | Listed in MC1492954 |
|---|---|
| New Outlook for Windows | Yes |
| Outlook for Android | Yes |
| Outlook for iOS | Yes |
| Outlook for Mac | Yes |
| Outlook on the web | Yes |
Two things aren't on that list:
- Classic Outlook for Windows isn't mentioned. That matches Microsoft's support page, which lists new Outlook for Windows but not classic Outlook among the clients that had the feature.
- Outlook.com isn't in the retirement notice, even though Microsoft's support page still lists it as a place where Themes by Copilot is available. Until Microsoft says more, don't assume the notice covers Outlook.com, and don't assume it doesn't.
What happens to the theme you have now
This is the important part. Your current Copilot theme doesn't vanish on retirement day. The notice says:
- Themes by Copilot will be removed from Settings. If you're using one now, you keep it until you change it.
- If your theme was set to refresh automatically, it stays applied but stops refreshing. You keep whatever image was showing last until you change themes.
- You can move from your Copilot theme to a non-Copilot theme, but you can't go back to a Copilot theme afterward.
The summary in the archive puts it this way: users with a Copilot license will lose the ability to select or revert to these themes, though current themes remain until changed.
In other words, the theme you have when the retirement reaches your account is the last one you'll get. If you picked a weather-based theme that refreshed every few hours, it will stay stuck on the last image it generated. Hopefully that isn't a rainy one.
Should you "lock in" a theme now?
Neowin, which first reported the change, advised that you can set a Copilot theme before the retirement and keep it afterward. That advice is consistent with the notice: since existing themes stay in place, choosing one before the feature leaves your Settings should leave you with one afterward. But Microsoft doesn't tell anyone to act before the rollout, and it doesn't describe any way to save, export or restore a Copilot theme. Treat this as an optional last chance, not a required step.
If you care about keeping a Copilot look, here's a sensible approach:
- Check whether the option is still there. On Windows or the web, go to Settings > General > Appearance. On mobile, go to Display & Appearance. If the Themes by Copilot section is gone, the retirement has already reached you.
- If it's still there, choose carefully. Pick or create the theme you want to keep. If you use a refreshing theme, remember it will freeze on its current image.
- Leave it alone once the retirement arrives. Changing to any non-Copilot theme is permanent.
- Don't count on backups. Microsoft gives no supported way to restore a Copilot theme, so a settings backup or reinstall won't bring one back.
If you'd rather use a standard theme, go ahead. The regular theme gallery stays, and you aren't losing anything except the option to return to a Copilot theme.
Section summary: Microsoft lets you keep what you already have, with no refreshing. Choosing a theme before rollout is optional, and switching away afterward is permanent.
What IT admins need to know
There's no tenant setting to change and no policy to deploy. The rollout runs from mid-October to late October, so different tenants, and possibly different users, may lose the option at different times. The notice gives no schedule per tenant, no way to opt out and no replacement feature.
The likely problem is help desk calls, not configuration. Someone switches to a plain theme on a whim, regrets it and files a ticket asking for the AI theme back. That can't be fixed. A short notice to Copilot-licensed users can prevent those tickets. It should say three things:
- The feature is going away in late October.
- Your current Copilot theme stays, but it won't refresh anymore.
- Switching to another theme is permanent.
Why is Microsoft doing this?
Microsoft didn't give a reason, and nothing in the notice hints at one. You could guess at low usage, image-generation costs or a change in Copilot priorities, but none of those is supported by the evidence, so take any confident explanation with caution.
It's fair to say the feature was always more decoration than productivity. When it launched, How-To Geek remarked that many Microsoft 365 subscribers would undoubtedly prefer the company to fix some of the program's functionality issues before focusing on how it looks. Two years later, Microsoft seems to have made a similar call, at least for this feature.
This doesn't mean Copilot is leaving Outlook. The retirement covers Themes by Copilot only. Copilot's features for drafting, summarizing threads and searching your mail aren't affected by this notice.
Bottom line
If you never used Copilot themes, nothing changes for you. If you did, decide before the rollout reaches you. Keep the theme you like, knowing it will stop changing, or switch to a standard theme and accept that there's no going back. Admins don't need to configure anything, but a short heads-up to users should save the help desk some calls.