Hi N:dlzc D:aol T:com (dlzc),

Re:  Double-A's missing messages in Outlook,  you suggested,
" I'd recommend he unsubscribe,  then resubscribe 
  to the particular newsgroups he is having problems with. ".

Yea that might be a good idea ...
  Only I'd just do a control-A  ( Select all )
  and then hit the delete key.

But I have the feeling something more is going on here.