Superb tool for complete email migration in one step!
The tool is designed in an ultra-smart way. I used it for bulk conversions and got surprised with its outcomes. It converted the whole content in one go; also it completely transferred the data from Mac Mail to OLM. No data loss/corruption at all! I recommend Digital Tweaks Apple Mail Export Tool for Apple Mail to Thunderbird/Outlook 2011/Entourage conversion etc.