Hello this Daniel, and I am give this review after using this tool from last 2 months and it working it very straight forward and the user interface for any non- tech guy is good enough as I am.
I easily converting my few MBOX file which got created by my Thunderbird and I want to use them as MSG for such reasons.
PCVARE Thunderbird Converter - Try Thunderbird Converter to export from Thunderbird to Outlook PST, MSG, EML PDF, HTML, EMLX, RTF, MBX & MBOX. Thunderbird Converter can Migrate MBOX files from Thunderbird into MS Outlook, Outlook express, Windows Live mail, Mac Mail.
ReliefJet Essentials for Outlook - A large set of useful and easy-to-use tools for every Microsoft Outlook user: Import, export and convert using EML,MSG,TXT and PST formats; remove duplicate items, process attachments and extract addresses; get reports and statistics and even more...