The All Parties column is particularly useful when you know that a particular person was party to an email, but you don't know whether their name would have been in the To, From, CC, or BCC fields. Put part of their name in this column to find any message they were party to. 


In the example below the surname 'Haigh' has been entered in the All Parties column and this has found instances where he/she was either the sender and the recipient.