1. Confirm your Outlook data is correct.
2. Connect your BlackBerry to the USB > Desktop Manager > Backup/Restore > Advanced.
3. In the RIGHT hand pane, you will see your device data. Scroll down to the Address Book data, so that line is highlighted. Click the CLEAR button below. This will delete ALL the Address book data on your device.
4. Sync your Outlook data to the BlackBerry as you would normally.