Yes, after converting from EMLX to MBOX the email will generally retain its formatting in another email client. The software preserves the email's content including text formatting, images, and attachment. You can convert EMLX to MBOX with the help of the third-party tools like DailySoft EMLX Converter Software. The emails are displayed with the same formatting as in the original EMLX file by this application. Whether you choose to export one EMLX file or several, results are not altered by this tool. It keeps the file quality remains unchanged. Read more :https://www.dailysoft.org/emlx/mbox/