If you want fast and accurate migration or you have large or multiple Thunderbird accounts or you want complete metadata preservation then you can use the CubexSoft EML Converter and transfer multiple emails in bulk and that too without making any unwanted modification safely this tool also offers various file formatting options such as MBOX, PST, PDF, MSG, Gmail, etc. and also it is compatible with all the Mac and Windows Systems. You can also export up to 25 files from the selected mailbox for absolutely free by using its demo.