Using the Inspire application you can easily read Lotus Notes NSF files for free.
Just you have to Install the application eSoftTools NSF to PST CONVERTER in your personal computer
I used this facility. So, I will describe it as per my preference.
I opened the Free NSF to PST Converter on my PC, then I browsed and added Lotus notes. After that option, I opted for scanning of files and then checked the preview of the NSF mailbox displayed on my screen due to which I checked all the mailbox data. Then I selected the export button.
Then I selected PST under Export options and chose the desired items to export.
Then I can check on the ongoing process.
One thing I will say that there is no restriction given on the number of NSF files for conversion to PST mailboxes.
So, you can easily read your files for free.