A user erroneously deleted ten folders containing only contacts, from the companies Public Folders mailbox. Restoring the folders with Outlook or Powershell brings the folders back.....but no contacts! After going back and forth with support over the last five days, they say that it was all permanently deleted. They claim the retention policy does not include the Public Folder mailbox and they are gone forever. I find this a bit hard to believe. I was notified by the user the same day it happened so it has only been five days now. Is Office 365's backup of PF really that weak?