Programs like phoneMiner should be able to extract the contacts from IPD Blackberry backups and export them as a Comma Separated Value files.
Convert BlackBerry backup (pre 2012) to Comma Separated Value.
We found 2 software records in the database related to .ipd to .csv file format conversion.
Microsoft Windows software - convert ipd to csv on Windows
A backup and recovery software for smartphones
Convert from ipd file format
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 ipd to csv. 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.
A conversion utility for BlackBerry backups