It doesn't seem that CDB to ARC conversion is possible. However the opposite one might and you could extract Symbian databases (*.cdb) from Nokia backups (*.arc).
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Conversion of cdb file format to arc file format beta
Search for cdb to arc converter or software able to handle these file types.
Convert Symbian OS contact database file to Nokia backup archive.
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: cdb file extension details, arc file extension details
CDB
Files with cdb suffix are contact databases commonly used in mobile phones with Symbian OS. These can also be found within backups created by Nokia PC Suite.
ARC
Files with arc file extension can be found as backups produced by certain Nokia phones based on Symbian OS. Can be recovered using Nokia PC Suite.
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