Sometimes your NSF file has corrupted due to some reasons like hardware and software-based. Hardware-based means data storage device failure, lost internet connectivity, sudden power failure, etc. and software-based problem means software malfunction, malware attack, virus attack, internal bugs, etc. in this situation I strongly recommend you to download
ATS NSF to PST converter application which is made up of best technology and algorithm and provide the best possible result to the user. It provides 24*7 technical support to the user.
Read More info: https://download.cnet.com/ATS-Notes-Converter/3000-2369_4-77530262.html