You can use NSF to PST Converter software to convert Lotus notes NSF file data into PST format. But before purchasing any NSF to PST Converter software must try the free manual trick. There are 2 manual solutions to convert NSF file into PST format- using Export-Import method or Setting up Co-existence method. Both these methods without any technical knowledge import NSF file data into PST format.

Check the steps of both these methods here: https://goo.gl/nk56Oa