Adding the 'to' column to message list in mac Mail

Hi all,

I know that this should be a simple thing, but I simply cannot remember how to do it. I want to do the following:

I have a mailbox which consists of lots of mails from myself to other recipients. I want to:

1. add the 'to' field so that I can see to whom they are sent;
2. sort on the 'to' column.

I've looked under the view menu and in preferences but can't seem to find the setting. any help appreciated with this because there are about 12,000 mails I need to go through.

thanks ever.