How to export vCard to NSF format without errors?
There are two ways to convert the vCard file to NSF format. One is manual and the other is professional; however, the manual method is a bit lengthy and the chances of data corruption are high. For this, you can use a professional converter in the second way; I advise you to use WholeClear VCF to NSF Converter. Because I have also used this professional tool, which is considered a very easy and reliable tool to use. It can transfer files without any errors and data loss. Windows OS, Windows XP, Windows 8.1, Windows 7, Windows Vista, Windows 11, Windows 10, etc., can all be used with this application. It can easily convert vCard versions 2.1, 3.0, 4.0, and other versions to Lotus Notes (NSF) format for all editions like 10.0, 9.0, 8.5, 8.0, 7.0, 6.0, and other versions. The best part is that it is free from all types of viruses and can export files of any size irrespective of the size or number of files. You can download the demo version to export some VCF contacts to NSF file format for free.

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Grayson Hall commented
You can export vCard files to NSF format without any errors by using a trusted solution like Softaken VCF to NSF Converter Software. This application can be simply installed on all Windows versions and have advanced functionalities that makes the conversion process simpler even for the non-technical users. You can view a live preview of the vCard files before proceeding with the migration process with this software. It exports the vCard files data without any data loss and with security. This tool supports all vCard files and provides accurate results after the conversion process complete. You can give it a try for free by utilizing its free demonstration version.
Read more: https://www.softaken.com/address-book-suite
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emmamartinez commented
To export a vCard file to NSF format without any errors, it will be better to use an automated tool. I recommend using the DataVare Address Book Converter tool for this. This software converts multiple VCF contact files to Lotus Notes without any problem. It is designed by professionals to convert vCard files to Lotus Notes. This application completes the migration process of the files without any restrictions. You can install this tool on any version of Windows that you use because it is compatible with all Windows editions. It also has a free trial version, with the help of which you can convert some of your VCF contact files to Lotus Notes without investing money.
Read More: https://www.datavare.com/software/address-book-converter.html