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.
GainTools MSG Converter - GainTools MSG Converter for bulk conversion of Outlook MSG files to PST, EML, EMLX, and MBOX formats. Instant, safe and unmodified conversion of MSG files by showing preview of all MSG database.
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...