Is there any option to open, read and save Windows Mail in Thunderbird? Yes Windows Mail to Thunderbird Converter to import Windows Mail into Thunderbird along with complete existing emails data like; To, From, Subject, Date, Time, Attachments (Photos & Documents), Message contents, Embedded images and more. Users can batch import Windows Mail to Thunderbird in fairly a single click. Download the Demo version of Windows Mail to Thunderbird Converter software to evaluate the software in saving Windows Mail files in Thunderbird MBOX format. Demo version of EML to MBOX converter tool can convert only ten emails of selected EML files. By using this advanced Save Windows Mail in Thunderbird tool you can easily read or view your eml emails into MBOX-based email client’s format.