I am rearranging all the emails and contact files. Hi, I just transferred all my Outlook PST files to iMac. whatever the reasons may be, they tend to transfer Outlook Contacts to Mac Address Book. Many users try to export Outlook contacts to Mac Address Book for many reasons like leaving the former Email Client i.e., Outlook, or they have a backup of their Outlook Contacts list in PST format and are trying to export it to Mac Address Book, etc.