This is using the Exchange 2007 and 2013 coexistence. There is 1 exch 2K7 and 1 exch 2k13 servers. All the mailboxes had been migrated to 2K13. Now is the turn for public Folders, in which all still kept in exch 2K7. There is only 1 PF database, btw, how to migrate them all to 2K13? Please show step-by-step.