BackRex Mail Backup - Version 2.0 BackRex Mail Backup allows you to backup, transfer or migrate your favorite mail reader settings and data such as mail folders, address books, filters, message rules and other. BackRex Mail Backup supports following mail clients: Outlook, Outlook Express, Eudora, IncrediMail, The Bat!. Additionally, Internet Explorer settings and favorites are also backed up. You can use BackRex Mail Backup to transfer your mail and settings to another computer.