If you need the best Office 365 Backup and Restore Tool then I will recommend you to use MacProTools Office 365 Backup Tool for Mac. The software is capable of backing up Office 365 emails to PDF, PST, EMLX, HTML, MHTML, MSG, CSV, DOC, DOCX, PNG, and more file formats. Using this utility you can migrate the O365 mailbox to Gmail, IMAP, iCloud, Live Exchange, etc. This software removes similar mail items from the conversion process.