Office Settings & Configuration

How to Restore the Missing New Outlook Toggle in Microsoft 365

Maira Mehtab Oct 9, 2026 869 views

Question details

The user needs to restore the missing toggle button to switch back and forth between classic Outlook and the New Outlook application.

How to Restore the Missing New Outlook Toggle in Microsoft 365

Product: Microsoft 365 Outlook
Device & OS: not provided
Scenario: Switching between the classic Outlook interface and the New Outlook experience.
Observed behavior: The 'Try the new Outlook' toggle switch is missing from the upper right corner or Help tab of classic Outlook, preventing users from changing their application version.

Before you start

Before modifying the system registry, verify that your organization's IT policy allows you to switch Outlook versions, and ensure you have administrative privileges. Carefully follow the registry steps, as incorrect modifications can cause system issues.

Solution 1Recommended

Restore the Toggle using Registry Editor

Modify the Outlook Preferences in the Windows Registry to re-enable the New Outlook toggle in the classic application.

This method changes the 'UseNewOutlook' registry key value. Setting the value to 0 enables classic Outlook behavior and brings back the toggle, while setting it to 1 forces New Outlook to open.

Please note that in some managed IT environments, this setting may be controlled by organizational policy and cannot be altered by standard users.

Open Registry Editor

Press the Windows key + R on your keyboard to open the Run dialog box. Type 'regedit' and press Enter to launch the Registry Editor.

Navigate to Outlook Preferences

In the Registry Editor, navigate to the following path using the left sidebar: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences.

Modify UseNewOutlook Value

In the right pane, locate the 'UseNewOutlook' entry. Double-click it and set its Value data to 0. If it does not exist, right-click in the empty space, select New > DWORD (32-bit) Value, name it 'UseNewOutlook', and set its value to 0.

Restart Outlook

Click OK to save the changes, close the Registry Editor, and restart your Outlook application. The toggle should now appear in the upper right corner or under the Help tab.

Restore the Toggle using Registry Editor

Group Policy Restrictions: If modifying the registry does not restore the toggle, your organization might be enforcing a group policy that overrides local registry settings. Contact your IT administrator for permission.

Solution 2

Pin Both Outlook Versions to the Taskbar

If the toggle remains missing, you can manually access and keep both classic and New Outlook pinned directly to your taskbar.

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Frequently Asked Questions

Why did the New Outlook toggle disappear from my application?

The toggle can disappear due to recent Microsoft 365 background updates, changes in organizational IT group policies, or local registry modifications that force a specific version of Outlook to remain active without the option to switch.

Can I use both classic Outlook and New Outlook at the same time?

Yes. By searching for 'Outlook' in the Windows Start menu and pinning both 'Outlook' (classic) and 'Outlook (new)' to your taskbar, you can open and use both applications simultaneously without needing the toggle switch.

What should I do if changing the UseNewOutlook registry key to 0 doesn't work?

If altering the registry key does not restore the toggle, check the 'Help' tab in classic Outlook, as the switch is sometimes moved there. If it is still missing, your organization's IT department is likely enforcing a policy that disables the toggle.

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