If you want to export NSF files from Lotus Notes but are unable to do so, then I will tell you the best solution by which you can easily export NSF file from Lotus Notes, that is
eSoftTools NSF to PST Converter Software. Many people have used this software and they have got very good results. Some techniques have also been provided in it for all the users, with the help of which users can export files even more easily. Along with this, this software also provides free demos.
More info- Export NSF file from Lotus Notes