What should I do to transfer the VCF file to the NSF file format?
If you are using any manual method to convert a VCF (vCard) file to Lotus Notes (NSF) format, then it is not sure that the file will remain safe. For this, you can use the WholeClear VCF to NSF Converter tool. It enables conversion of VCF files to NSF format without any data loss. All Windows OS versions, including 11, 10, 8.1, 8, 7, Vista, and XP, are compatible with this application. You can convert files of any size without any restrictions, as it can transfer VCF files of any size or number. The installation of the Lotus Notes email application is required by this app for the completion of the migration process. vCard versions 4.0, 3.0, 2.1, and many others are supported by this tool. It can transfer all VCF files from Outlook, Skype, Google Contacts, and iCloud to NSF format, and besides being virus-free, it is completely safe. You can test the free trial version, which can convert up to 25 VCF files, to know more about its capabilities.

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Cillian commented
VCF is a contact file format, hence the procedure might be a bit challenging if you want to convert a VCF file to NSF file format. The most effective strategy to follow is to use a specialist tool that can manage the conversion for you as there is no built-in or manual method to accomplish this directly. You might try the DataVare VCF to NSF Converter among various other tools. It requires not much technical expertise and is really easy to operate. The utility handles everything; you simply load your VCF file, decide where to put the NSF file, and let it go. It maintains all of the contact information—name, phone number, email address, etc.—safely. You can try out its free trial version to get more info about all its functionalities.
Read more: https://www.datavare.com/software/address-book-converter.html
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calebhayes commented
For the transfer of the VCF file into NSF file format you can search for an automated tool without wasting your precious time in the manual methods. Because these manual methods are lengthy and time-consuming, that’s why I recommend using an automated tool like TrustVare VCF to NSF Converter Software. It can complete the conversion process in just a few simple as well as straightforward steps. You can use this application on any Windows OS. This software can also do the batch migration of the files to save time-consumption. Also, if you are interested to try this software but without paying for its you can download its demo version that is available for free.
Read more: https://www.trustvare.com/contacts-manager/