Could you elaborate more about how to insert Outlook data files and using them for daily archiving of my mailbox? I love MAC OSX Sierra and wish to use Outlook on the MAC, so i guess other question i have is whether i can use pst on MAC OSX. Greetings Easytweaks team! A co-worker told me that he is using pst files in order to keep backups of his email box, calendar, journals and contact people.