You are searching for an expert solution for converting EML files to NSF files. Use the MailConverterTools EML to NSF Converter. This app can easily convert your many EML files to NSF format. This software can work with multiple email clients like Windows Live Mail, Mozilla, Thunderbird, Outlook Express, IncrediMail, etc. Apart from this, the software's premium feature one of them is Multiple Saving Options, that helps user to save EML files to a new location, an existing NSF file, or in HTML or Text format.