How to Restore the Classic Outlook Calendar Sharing Permissions Dialog
Question details
The user wants to restore the classic calendar sharing permissions dialog in Outlook to access missing custom settings.
- Product
- Microsoft Outlook
- Device & OS
- Windows
- Scenario
- Attempting to assign specific custom permissions to a shared calendar in newer versions of Microsoft Outlook.
- Observed behavior
- Newer Outlook updates display a simplified calendar-sharing dialog that lacks certain advanced custom permission options found in older versions.
Before proceeding, ensure you back up your Windows Registry, as modifying registry values incorrectly can cause system instability. If you are on a managed device, consult your IT administrator.
Modify the Registry to Restore the Legacy Dialog
Use the Windows Registry Editor to force Outlook to display the classic calendar sharing interface by adding the ShowLegacySharingUX value.
This method involves navigating to the Outlook options path within the Windows Registry and creating a specific DWORD key. This registry value forces the Outlook application to bypass the modern, simplified sharing UI and load the classic permissions dialog instead.
Press the Windows key + R to open the Run dialog, type 'regedit' into the text box, and press Enter. Click 'Yes' if prompted by User Account Control.
In the Registry Editor, go to the following path: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\Calendar. Note that '16.0' corresponds to Office 2016, Office 2019, and Microsoft 365.
Right-click on an empty space in the right pane, select 'New', and click 'DWORD (32-bit) Value'. Name the new value exactly 'ShowLegacySharingUX'.
Double-click the newly created 'ShowLegacySharingUX' item, change the 'Value data' box from 0 to 1, and click 'OK'.
Close the Registry Editor and completely exit Microsoft Outlook. Reopen Outlook for the new registry changes to take effect.
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Frequently Asked Questions
Why did my Outlook calendar sharing dialog suddenly change?
Newer versions of Microsoft Outlook automatically roll out a simplified sharing interface designed to streamline basic sharing for most users. However, this redesign intentionally hides some of the advanced custom permission settings that were available in the classic view.
Do I need administrator privileges to modify the registry?
Yes, opening and editing the Windows Registry generally requires administrative rights on your PC. If you are using a workplace computer, you may not have the necessary permissions and will need to contact your IT support team to apply the ShowLegacySharingUX fix.
Will updating Outlook revert the classic dialog settings?
Major Office feature updates or profile resets can occasionally override custom registry configurations. If your calendar sharing dialog reverts to the modern simplified view after an update, you simply need to repeat the steps to recreate or re-enable the ShowLegacySharingUX registry key.
