phoneMiner program can be used to extract old BlackBerry backups (*.ipd). Contacts in them can be exported in the form of XLS workbook.
Convert BlackBerry backup (pre 2012) to Microsoft Excel 97 to 2003 workbook.
We found 2 software records in the database related to .ipd to .xls file format conversion.
Microsoft Windows software - convert ipd to xls 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 xls. 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