I came across this error with a client today and did not find it documented anywhere – so here it is! When running the Public Folder sync script Sync-ModernMailPublicFolders.ps1 which is part of the process of preparing your Exchange Online environment for a public folder migration, you see the following error message: UpdateMailEnabledPublicFolder : Active Directory operation failed on O365SERVERNAME.)365DATACENTER.PROD.OUTLOOK.COM. The object ‘CN=PublicFolderName,OU=tenant.onmicrosoft.com,OU=Microsoft Exchange Hosted Organizations,DC=)365DATACENTER,DC=PROD,DC=OUTLOOK,DC=COM’ already exists. At C:\ExchangeScripts\pfToO365\Sync-ModernMailPublicFolders.ps1:746 char:9 + UpdateMailEnabledPublicFolder $folderPair.Local $folderPair.Remote; […]
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