NSF files are basically the database files of IBM Lotus Notes. These files end in the extension - .NSF. These .NSF database files store the Lotus notes information. This information comprises of Meta data, user data and design information. There are various types of Lotus Notes databases and the most common of them are the mailbox databases. These are basically used for storing Lotus Notes mail. Address book databases are also common; they store the contact records usually on users’ PC. NSF can be converted to PST using Export Notes Software used for Lotus Notes to Outlook Migration