You want to make sure that the contacts on your BB and on your Outlook have exactly the same info. Wouldn't want to get rid of a contact with info you didn't have on the other source (be it BB or Outlook).
To delete all the contacts on your BB, plug your phone into your computer and open up desktop manager. Go to backup/restore>advanced>scroll to address book (make sure you are in the right hand column that says device database)>highlight>select clear at the bottom of the column.
This will clear your device's address book.
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