For taking the backup of Office 365 mailbox on the Mac local drive and save the data into any file format like PST, MSG, EML, MBOX, etc. The Mac user can make use of Office 365 Backup for Mac which is a great tool to use for downloading the emails data
from Office 365 mailbox to local computer drive on any version of Mac PC. This software is very easy to use and anyone can operate it without any problem.
you can try it from here:-
https://www.mailvita.com/office365-backup-for-mac/
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