You can easily convert NSF to PST format by Stellar Converter for NSF tool. This tool exports NSF files to PST, MSG, EML, RTF, PDF, and HTML, with no file size limitations. You can also download the free version which allows you to preview the converted file.
Below are the steps to convert NSF to PST format-
1. Browse or find the NSF File and then click convert.
2. Select specific mailbox to convert
3. Select the file format for saving
4. Browse to Save Converted File
5. Saving Progress
6. Conversion Successful
Visit here- https://www.stellarinfo.com/email-repair/nsf-pst-converter.php