When entering the first or second letter of an e-mail address in a new e-mail using outlook you are presented with some e-mail addresses that start with these letters. You can then select the correct one, click on it and it enters the address line

My question is where are these addresses stored, so that I can delete an incorrect one and replace it with the correct address

Or how can I search for them?

They are not in the Outlook Address book or contacts list

Many thanks