To open MBOX file in Webmail, you must use the Yota MBOX Converter Tool on any Windows system. It allows you to directly transfer MBOX files to Webmail with attachments. Moreover, you can directly import MBOX to Gmail, and any IMAP-based service with this wizard. It support transferring MBOX files of Thundebird, Mac Mail, Google Takeout, and other applications.

Steps to Open MBOX File in Webmail:

1. Run the tool and click Open.
2. Click Email Data Files and select MBOX files.
3. Then click the Export tab and choose the IMAP option.
4. Enter Webmail credentials and click Save.