I had this same question and after testing a few options,
TrustVare NSF Contact Converter turned out to be the best. It worked really well as an NSF to VCF Converter and helped me migrate my Lotus Notes contacts effortlessly. You can also use it as an
NSF to vCard Converter to convert NSF to VCF quickly. The interface is very easy to use and it supports all vCard formats like 2.0, 3.1 and 4.1. It works smoothly on all Windows versions and also provides a free demo to test it.