Enable Migration
Control panel can import all the public folders which are selected and exists on backend. To enable migration of Public Folders, navigate to the following path:
Click Manage in front of the organization under which you want to import public folders. Click Enable Migration button. After clicking on Enable migration tab go to the Public Folders tab. Here you will see the Import button under Public Folders tab.
Select Public folders to be imported and click on Save to complete the public folder import process.