If you need to export contacts from your Symbian phones and save them as vCard file (.vcf), your best option is to use some of the utilities for Symbian, such as Noki. With that program you should be able to access .cdb databases and save your contacts as .vcf file, or .vcard should you need it, it is the same thing.
Convert Symbian OS contact database file to vCard file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert cdb to vcard on Windows
A small usefull program for exploring and extracting of files created with Nokia PC suite
Convert from cdb file format
|Yes, Noki supports cdb file conversion as a source file type.||No||No||No||No||Yes||No||No|
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.