Try SysInspire NSF to PST converter software. By using this tool you can export emails from Lotus Notes NSF to MSG file, MBox, etc. it has 13+ file formats for conversion. It can show the preview of a Lotus Nts during conversion. It has a feature of PST split users can filter their mails by using specified dates. It has a demo version that can help users to convert 25 files from each folder. It has a technical support that can help users by using mails or live chat.