I would like try to use perfect NSF to PST migration software comes with smart preview options which allow you convert all the mailbox objects and show them all in view.
https://www.gaintools.com/nsf/pst/

 

Check eSoftTools NSF to PST Converter for NSF recovery. It is secure and fast. It supports all versions of IBM server and MS Outlook. It does not need MS Outlook installation for conversion. It provides an option to split PST file after conversion. It can restore mails, calendar, tasks etc.

Read more about NSF to PST Converter here.