Use Desktop Manager, sync to Outlook or an ASCII file.
The sync the Outlook or ASCII file back to your BB.
or just use the Backup Restore function in Desktop Manager, then restore, advanced, to put the old address book back on the new BB.
Get Desktop Manager here. For what you are doing here, simply download the Version 4.2, Service Pack 2, withOUT Roxio Media Manager, the smaller download. BlackBerry Desktop Manager Downloads - BlackBerryFAQ