Converting NSF files to VCF format is a bit sensitive because if the right method is not adopted, contact details can be missed or data can get corrupted. The best way to avoid data loss is to use a reliable tool. I used Softaken NSF to VCF Converter when I had to convert Lotus Notes contacts to VCF.
This tool is specifically designed for this purpose. It converts all contact details from the NSF file, such as name, email, phone number, address, job title, company, etc., to VCF in a very accurate manner. There is no problem with any formatting or field loss. It is also very easy to useāthe interface is simple, and a Lotus Notes installation is required, but there are no other complicated steps.
This tool also offers a free trial version so that you can test it by converting a few files first. Also, their technical support is good; if you ever do not understand any step, help is available quickly.