
However, with this particular Public Folder, we were not able to sync this to the cloud because there was a domain defined that was not listed in the Office 365 tenant. The domains from the above screenshot were listed in our Tenant. So why would the Sync not work? Well, apparently these addresses are not on par for what can be revealed with Powershell.
PowerShell
Simply using the ‘Get-MailPublicFolder’ cmdlet can find any Public Folders that are mail enabled. It can also find the email addresses for that mail enabled PublicFolder:

Once revealed, we can remove the email addresses either with PowerShell or ADSIEdit. After that the folder can now be moved to Office 365.