Why cant I import MBOX emails into Office 365 directly?

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You cannot import MBOX emails into Office 365 directly because Office 365 does not support the MBOX file format. Email clients like Thunderbird commonly use MBOX, while Office 365 works with formats such as PST or uses Exchange/IMAP-based data access. Due to this difference in file structure and compatibility, direct import is not possible.
To resolve this, you need to convert MBOX files into a supported format or migrate them using an intermediate method. A professional MBOX Converter like BLR Tools helps bridge this gap by converting MBOX files and directly importing them into Office 365 while preserving emails, attachments, metadata, and folder hierarchy.
Manual methods, such as using an email client to sync MBOX data via IMAP, are also possible but involve multiple steps and can be time-consuming.
For more detailed steps and complete guidance, you can refer to the full blog.
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