The most trustworthy NSF file recovery tool is Softaken NSF to PST converter software. It has the ability of restoration of NSF data into many different formats such as PST, EML, EMLX, HTML and many more. It lets the user recover each and every element of the mailbox consisting of messages, contacts, calendar, attachments, notes, tasks, journals etc.
https://www.softaken.com/nsf-to-pst-converter