Converting .DBX files of Outlook Express to .PST in MS Outlook is possible when you are doing the emails or data conversion into same machine but if you want to convert .DBX files from Outlook Express into Outlook in different machine then it is not probable.If you are a non-technical user or looking for large scale migration, then third party DBX to PST Converter software is a better option for you. In my knowledge, you can give a chance to free demo version trail- http://www.mannatsoftware.com/stellar-dbx-to-pst-converter.html

Try the most prominent solution to export Outlook Express DBX to Outlook PST format without losing a single email message. It safely converts DBX to PST format along with attachments and allows user to import DBX to Outlook without any extra efforts.The simple GUI and advance features of the utility enables user to convert the flawless conversion of DBX to PST format in few moments. The tool also provides the free demo of the utility by which it offers to convert 25 items from ZOOK DBX to PST format and efficiently test the entire features of the utility.

Explore More:https://www.zooksoftware.com/dbx-to-pst/

The ToolsGround Outlook Expres to Outlook Converter tool can migrate all of your files without any data loss and changes in your files. You can easily select your files before migrating.
More Info:- Outlook Express to Outlook Converter