Fix Public Folder Calendars Not Synchronizing After Exchange Migration
Question details
Users cannot view or synchronize public folder calendars after migrating from Exchange 2010 to Exchange 2016.
- Product
- Microsoft Exchange
- Device & OS
- not provided
- Scenario
- Accessing and synchronizing shared company schedules via public folders post-migration.
- Observed behavior
- Public folder calendars fail to synchronize for certain users, even after assigning a DefaultPublicFolderMailbox, pointing to a failure in client access permissions.
Ensure you have administrative credentials for your Exchange environment and can access the Exchange Management Shell to execute PowerShell cmdlets.
Reset Public Folder Client Permissions via PowerShell
Use Exchange Management Shell commands to remove and re-add user permissions, restoring their ability to synchronize the calendar.
During migration, client permissions on public folders can sometimes fail to map correctly in the new environment. Refreshing these permissions directly on the server usually forces the Outlook clients to resume synchronization.
Log in to your Exchange 2016 server as an administrator and open the Exchange Management Shell.
Run the command 'Get-PublicFolderClientPermission -Identity "\YourPublicFolder"' to review the current permissions. Check if the affected user is listed and has 'Editor' or 'Owner' rights.
Remove the existing permissions for the affected user by running: 'Remove-PublicFolderClientPermission -Identity "\YourPublicFolder" -User "Username"'.
Grant the permissions back to the user by executing: 'Add-PublicFolderClientPermission -Identity "\YourPublicFolder" -User "Username" -AccessRights Editor'.
Ask the user to restart their Outlook client, navigate to their Public Folders view, and confirm that the calendar is now synchronizing.
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Frequently Asked Questions
Why do public folder calendars stop syncing after migrating to Exchange 2016?
During a migration, public folder hierarchies and mailboxes are moved to the new server, but individual client permissions can sometimes become orphaned or fail to apply correctly. This prevents the end user's Outlook client from authenticating the sync request.
What is a DefaultPublicFolderMailbox?
A DefaultPublicFolderMailbox is a setting assigned to a user mailbox that tells the Outlook client which specific public folder mailbox it should connect to in order to discover the public folder hierarchy. While assigning this fixes general visibility issues, it does not fix individual folder permission errors.
What permission level is required to sync a shared public calendar?
Typically, a user needs at least 'Editor' or 'Owner' rights on the specific public folder calendar to fully sync, edit, and manage the calendar items successfully. 'Reviewer' rights only allow read-only access.
