Nokia NbuExplorer not only works with NBU but also NFB backups and can extract the data from it. So you can use it to export the contacts from the backups and save them in vCard (*.vcf format).
Convert Nokia PC Suite phone backup to vCard contacts file.
We have found 2 software records in our database eligible for .nfb to .vcard file format conversion.
Microsoft Windows software - convert nfb to vcard on Windows
Noki is the explorer for Nokia backup files and a utility used to explore and extract Phone book, Text message, MMS, Calendar, Memo, Bookmark and other user files from the backup file of Nokia phone (using Nokia PC Suite).
Convert from nfb file
to vcard file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned nfb to vcard. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Nokia NbuExplorer is a free explorer for Nokia NBU files.