How to Find the Source of a Duplicate Shared Calendar in Outlook
Question details
The user needs to identify the root location of a duplicate shared calendar in Microsoft Outlook that cannot be found using standard mailbox permission or PowerShell checks.
- Product
- Microsoft Outlook
- Device & OS
- not provided
- Scenario
- Managing organizational shared calendars and troubleshooting why identically named calendars appear in the user interface.
- Observed behavior
- Outlook displays two calendars with the same name, but administrative tools and permissions only show one belonging to the user's mailbox. The second calendar appears to originate from a different, hidden source.
Ensure you have access to Outlook on the web and the appropriate permissions to view and browse your organization's Exchange Public Folders.
Locate and Add the Calendar via Public Folders
Use Outlook on the web to verify if the duplicate calendar originates from an organizational Public Folder and add it directly to your profile.
In many corporate environments, duplicate calendars are not standard mailbox calendars but rather shared resources stored in Public Folders. Because they exist outside the personal mailbox architecture, standard PowerShell commands for mailboxes will not list them.
Open your web browser, navigate to Outlook on the web, and sign in using your organizational credentials.
Navigate to the Mail or Calendar view and expand your left-hand navigation pane to locate the 'Folders' section.
Click on 'Public Folders' and browse through the directory tree to search for the calendar that matches the duplicate name.
Once located, right-click the public-folder calendar and select the option to add it to your favorites or directly to your Outlook profile.
Restart your Microsoft Outlook desktop application to ensure the newly added public-folder calendar syncs correctly and can be managed.
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Frequently Asked Questions
Why does Outlook show multiple calendars with the exact same name?
This typically happens when a user is subscribed to both a standard shared mailbox calendar and an organizational Public Folder calendar that have been assigned identical names.
Why can't I see a shared calendar in PowerShell permission results?
If a calendar is hosted in a Public Folder rather than a user mailbox, standard mailbox permission scripts in PowerShell will bypass it. You must run specific Public Folder PowerShell cmdlets to view its permissions.
Does Outlook on the web display calendars differently than the desktop app?
Yes, server-side calendars, especially those stored in Public Folders, may immediately appear in Outlook on the web but often require a manual sync or manual addition to be visible in the desktop application.
How do I remove a duplicate shared calendar from my Outlook view?
Right-click the unwanted duplicate calendar in your Outlook desktop calendar pane and select 'Delete Calendar'. If it automatically returns, you may need to remove your permissions from the source Public Folder or shared mailbox.
