If you want to convert the NSF file data to Outlook PST or other formats (MSG, EML, HTML, and RTF, etc.) at a time or parallelly. Then I recommend the A2Z Migrations for NSF to PST converter it is a quick solution to add the single or multiple NSF files and migrate its whole data such as emails, tasks, contacts, calendars, appointments, and attachments, etc. into the Outlook PST file format.

More Info- http://www.a2zmigrations.com/nsf-to-pst-converter/