What are some alternatives?
When comparing Regain PST to MBOX Converter and ReliefJet Essentials for Outlook, you can also consider the following products
GainTools PST to EML Converter - GainTools PST to EML Converter extracts your Outlook PST file then exports into EML file format
MailsDaddy OST to PST Converter - Download MailsDaddy OST to PST Converter software to retrieve Offline OST file data and export in PST and many various format like-EML, MSG, HTML, RTF, MHTML, MBOX, Office 365 and Live Exchange Server.
Mail Passport Pro - The Mail Passport Pro has been professionally developed for a special purpose, which is to convert Apple Mac Mail, Microsoft Entourage Archive 2004/2008, Mozilla Thunderbird, RGE files, MBOX files, EML files to Outlook for Windows PST format.
Cloud Email Conversion - Looking for email migration service? Cloud Email Conversion easily turns the bunch of email files into the Outlook PST file preserving the folders structure
SysTools MBOX Converter - SysTools MBOX Converter tool repair & extract all email attachments from Mbox file & convert into data items of other email client application on Windows Platform.
EML to PST Converter - EML to PST Converter is an ultimate email conversion and migration tool.