eSoftTools Thunderbird Email Viewer software is a useful option for converting Thunderbird emails to Outlook PST format for free. This tool allows you to open and read MBOX files from your Thunderbird profile without needing any email client. Users can preview emails and check essential data such as subject, sender, recipient, and attachments, making verification easy before conversion. Although primarily a viewer tool, it serves as a helpful free solution for understanding the conversion process and analyzing data, especially for beginners planning an Outlook migration.

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