Hi,
If you want to remove Default User permissions from root public folder then use this CmdLet in EMS
Remove-PublicFolderClientPermission '\' -User Default -AccessRight Author -Server MailboxServer
Hope this helps.
Regards,
Laeeq Qazi|Snr Software Engineer(Exchange + Sharepoint + BES + DynamicsCRM)
www.hostingcontroller.com