It there a quicker way to review the senders and recipients and add them to my Contacts folder without creating a massive amount of duplicate contacts? This is of course a really slow process and I think I've learned my lesson by now. I'm now going through my Inbox and Sent Items folder and right click on a sender or recipient and choose: Add to Outlook Contacts Sadly, due to an oversight when migrating my Outlook data from one computer to the other, my AutoComplete cache was lost and since I never added people as a Contact, my Contacts folder is heavily outdated.