Yes, you can migrate MBOX emails to Office 365 without installing or using Thunderbird. The Aryson MBOX Converter Tool can directly process MBOX files and migrate them to an Office 365 mailbox. It supports MBOX files from sources such as Apple Mail, Google Takeout, Thunderbird, Eudora, and other MBOX-based email clients, while preserving emails, attachments, folder hierarchy, and metadata.

To import MBOX email to Office 365 , simply add the MBOX file or folder, preview the mailbox data, select Office 365 as the destination, sign in using the required Microsoft authentication, and start the migration. The tool also supports multiple MBOX files in bulk, date-range filtering, duplicate removal, and direct cloud migration, making it useful when moving a large MBOX archive without relying on Thunderbird as an intermediary.