If you want to convert Lotus Notes NSF to Apple Mail EMLX MBOX, so I suggest you to get SysInspire NSF to PST converter software. It convert NSF file into multiple file format such as NSf to PST, EML, EMLX, Yahoo Mail, Gmail, MSG, MBOX, Zimbra-tgz. Etc. It has 15+ file format for conversion. It has a demo version that can allow users to convert 25 items from each folders. It has a technical support all users can get help by mail or live chat. It has email filtration users can filter mails with specific dates.
If you want to Export NSF files to PST for free then you should try eSoftTools NSF to PST Converter Software. It has the ability to convert a single NSF file as well as bulk conversion. It has many formats for converting NSF files into PST, MBOX, EML, EMLX, MSG, HTML, CSV, VCS, and many other formats. If you have any doubt about the software then you should try the demo version software. In the demo version, everyone can convert their 25 items from the NSF file without any purchase. If you are interested to buy the software then go with the link given below.