If you want to convert NSF file to PST. I would suggest you according to my personal knowledge, Use third party tool DRS NSF to PST converter. The tool is capable to convert multiple Lotus Notes NSF mailboxes to PST Outlook and converts other formats such as EML, EMLX, MSG, and HTML. It supports all version of Lotus Notes, Outlook, and Windows OS. You can download its free trial version and migrate and convert the first 50 items per folder.