Import DBX file to Outlook format
I suggest you try the DBX to PST Converter tool for migrating your files safely. It's a reliable solution for migrating big and unlimited files without any data loss. The DBX to PST Converter is an advanced tool that can easily work on all Windows operating Systems-10, 8, 7, XP, Vista, etc… The Converter tool allows users to convert DBX files in PST, EML, MSG, EMLX, MBOX.
Visit here for more info: https://www.osttopstapp.com/dbx-to-pst.html
Ways to Import Outlook Express DBX files to Outlook 2016, 2013, 2010, 2007
Open MS Outlook 2010, click on File >> Open >> Import.For Outlook 2007 users, Open File menu and click on Import and Export option.Click on Import-Internet Mail and Addresses >> Next.Select Outlook Express >> Choose Import-mail-checkbox.
I hope this will help