Dale,
Please try the following steps (from Outlook 2002):
1. Click the "Organize" button to display the "Ways to Organize Inbox" pane.
2. Click Junk Email.
3. Click the link for "Edit Junk Senders"
4. In the Edit Junk Senders dialog box locate and select the item to be
"unblocked"
5. Click Delete.
Hope this helps.