Outlook app not showing the toggle switch for trying new outlook

Question

When first use outlook, it's a new outlook. Yesterday it suddenly changed to classic outlook and there is no copilot button. And there is no button to change to new outlook at the right hand side.

Answer 1

Dear @Tony Lam (CN),

Thank you for posting your question in the Microsoft Q&A forum.

Based on your description, Outlook switched from New Outlook back to classic Outlook, and the toggle to switch back (along with Copilot) is missing

When Outlook no longer meets the requirements for New Outlook (license, account type, or admin policy), it automatically switches back to classic Outlook and hides the “Try the new Outlook” toggle. Since Copilot is only supported in New Outlook, the Copilot button is also removed. This behavior is expected and usually controlled by licensing or organizational policy.

For more detail information, you can refer to this article: Switch to new Outlook for Windows

Besides that, please try to some suggestions as log out and log in to your account again to check the toggle switch appear again or not.

Try to uninstall then reinstall the app

Try searching for Outlook in the Windows search bar to check whether two versions of Outlook appear there.

Also try to switch to Outlook web version to check.

I hope information above meet your expectation, if it does not, please leave the comment below so I can support you more effectively.

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Answer 2

The missing “Try the new Outlook” toggle is usually caused by one of these:

1. Unsupported Outlook/Windows setup
   • New Outlook requires Windows 10 build 1809 (17763) or later.
   • Only Microsoft 365 subscription channels are supported (Current, Monthly Enterprise, Semi-Annual Enterprise (preview)).
   • Perpetual/non‑subscription Outlook (Outlook 2019/2021, one‑time Office purchase, standalone Outlook) does not support the new Outlook toggle.
2. Admin or policy has hidden the toggle
   • Admins can hide the toggle for work/school accounts.
   • In classic Outlook, the HideNewOutlookToggle registry value under HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General controls visibility:
     • 1 = toggle hidden
     • 0 = toggle visible (after restarting Outlook)
   • Admins can also disable it via cloud policy in the Microsoft 365 Apps admin center using Hide the "Try the new Outlook" toggle in Outlook.
3. Account type not supported
   • POP or on‑premises Exchange accounts in the classic Outlook profile can prevent the toggle from appearing.
   • Some work/school accounts and certain license types are not supported in new Outlook.
4. Sovereign or restricted networks
   • Devices that are or were part of a sovereign network cannot switch to new Outlook.

If the environment should be supported but the toggle is still missing:

• Verify Windows build and Outlook channel/version meet the requirements.
• Check with the Microsoft 365 admin whether a cloud policy is hiding the toggle.
• Check the HideNewOutlookToggle registry value and set it to 0 if present, then restart Outlook.
• If still unavailable, collect the .etl logs from %Temp%\Outlook Logging and contact Microsoft Support as documented.

Copilot in Outlook is only available in the new Outlook experience and with eligible Microsoft 365 business licenses; if the toggle is blocked or unsupported, Copilot will not appear.

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References:

• Resolve deployment issues in the new Outlook for Windows
• Switch to new Outlook for Windows
• Toggle out of the new Outlook for Windows
• Getting started with the new Outlook for Windows