Is it possible to convert a VCF file to NSF format?
Yes, VCF file format can be transferred to NSF file type. For this, you can use the WholeClear VCF to NSF Converter tool. It can transfer VCF files to NSF format. That approach lets users transfer contacts from vCard to Lotus Notes files without any data loss. You have the ability to specify the path to the resulting Lotus Notes files on their system. All Lotus Notes versions, including 10.0, 9.0, 8.5, 8.0, 7.0, 6.0, and many others, are supported by this software without any problem. There is no size constraint and it can handle a large amount of data in a single attempt. The tool can be easily downloaded in Windows OS of any version. It also provides a free trial version in which 25 VCF contacts can be transferred to NSF.

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Cillian commented
Although it is absolutely feasible to convert a VCF file to an NSF format, since they are two quite different kinds of files you will need some assistance from an application. While Lotus Notes mostly uses NSF for emails, contacts, and more, VCF retains contact information. You can complete this process of conversion by using the DataVare VCF to NSF Converter, and it made the whole process so much easier. I didn’t have to worry about data getting messed up or anything. You can evaluate its functionalities for free by having its free trial version download.
Visit here: https://www.datavare.com/software/address-book-converter.html
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Grayson Hall commented
It is possible to convert a VCF file to NSF file, but you are not advised to do it manually without the right tool. Since these are completely different formats, you’ll need a special converter to move your contact data from VCF to NSF properly. I had the same problem when I tried to add my contacts to Lotus Notes. I tried a few different tools and finally ended up with the Softaken VCF to NSF Converter. It’s easy to use, even if you're not very technical, and it kept all the contact details like names, phone numbers, and emails intact. Definitely recommend giving it a try if you’re looking for a simple way to handle this conversion.
Reda more: https://www.softaken.com/address-book-suite