If you essential to convert the NSF file to Outlook PST format, you can use the NSF to PST Converter Tool, which is a third-party program. This app has a very simple interface that anybody can use without any prior knowledge with it. Other file types
supported by this application include MSG, EML, EMLX, PST, MBOX, and more. You can convert a file called NSF to an Outlook PST file in any version of Outlook and on any version of Windows.
Refer:
https://www.sametools.com/convert/nsf/
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