If you are searching for a method to back up your Office 365 mailboxes, then you must try the Office 365 Backup Tool. It is a free and reliable software for backing up your Office 365 mailbox data locally into PST, PDF, EML, MBOX, and CSV. It includes features like a date filter, skipping duplicate emails, and it backs up Gmail emails with or without attachments. It is compatible with all the versions of Windows OS.