Think this would be perfect for your phonebook as you could pull all the orginisations data in one go, not sure how big a job this would be so I may even look at doing it myself.
You can modify the checkdir.php and vphonebook.php scripts to do ldap searches if you want. In version 2.10 the phonebook also has an import function, if you can export to csv you can import the data into the phonebook.
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Best regards,