Is it possible to convert .nbf files directly to .vcf format.
Converting Nokia Backup Files directly to vCard Files (.nbf to .vcf conversion) should be possible using Nokia PC Suite, a set of applications used to manage older Nokia mobile devices. It allows users to save their contacts to .csv format (Comma-Separated Values Files).
Then all you need to do is to convert .csv to .vcf using one of the numerous file conversion utilities to get your desired vCard.
A set of applications used to manage older Nokia mobile phones