I suggest you download eSoftTools NSF to PST converter software. This is one of the best converters for you. You can convert NSF files to PST, EML,EMLX, Office 365, MBox, MSG,13+ file formats. It has a feature of email filtration that can help you to filter your mail by using dates, it can export mails with attachments such as photos, calendar, contects. It has technical support 24x7 by mail or live chat, it can recover corrupt files of NSF. It has a split option where you can split PST files in small sizes.