Well if you go for a reliable tool like eSoftTools NSF file Converter then the task to convert Lotus Notes can be quite easy. Even this tool is not dependant on the Outlook environment for migration. All you have to do is install this tool for free from the official website of eSoftTools. Then open the tool and provide the NSF file which is needed and then choose the mailbox items which are required. After selection, just click on convert and choose PST as the result type. The entire process will be done by the software. To split resultant PST file into small PST file, splitting feature is offered to the user while migration only. No data is modified during exportation. Also, the hierarchy remains constant throughout the process.
Get more info: Convert Lotus Notes to PST without Outlook
Get more info: Convert Lotus Notes to PST without Outlook