Before purchasing any paid software for NFS to PST conversion, you should try an easy manual trick. The manual trick requires no paid software or any other cost. First, you need to save the NSF files' into such format which is supported by Outlook client. Luckily, IBM Lotus Notes provides you two file formats into which you can save your NSF files: Comma Separated Value and Structured Text. After that, you can import this new file to MS Outlook client by using its Import feature. Refer to this article for complete information - visit :-
https://www.softaken.com/nsf-to-pst-converter