mboxPack is a System Utilities software developed by BitDaddys Corp.. After our trial and test, the software was found to be official, secure and free. Here is the official description for mboxPack: mboxPack - Pack individual email files into mbox files. - A quick, simple and easy to use utility that lets you combine eml, msg and txt email files into Thunderbird compatible mbox files that are ready to use! Got old email that you want to get into Thunderbird? This utility makes it easy! you can download mboxPack free now.