Yes, you can back up an entire Office 365 mailbox, including emails, contacts, calendars, tasks, notes, and attachments. The SysInfo Office 365 Backup Tool is designed to back up these mailbox items to formats such as PST, MBOX, PDF, EML, MSG, and CSV.

To perform a complete backup, sign in to your Office 365 account using Modern Authentication, select the required mailbox, and choose the mailbox folders or data types you want to back up. You can also apply date filters, remove duplicate items, preserve the original folder structure, and save emails with or without attachments.

The tool also supports batch processing, making it useful for backing up multiple Office 365 accounts in business environments. It can additionally restore PST and OST files directly to Office 365 mailboxes. This provides a convenient way to maintain a local copy of important Office 365 data for archiving, migration, recovery, or long-term storage.
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