How do I clear an auto-complete email address from Outlook?

1. In Outlook, create a new email.
2. In the 'To' field, start typing the first few letters of the contact's name or email address you want to clear. The memorised (auto-completed) contact will display in a drop-down list.
3. Hover over the contact, then click the cross 'X' icon to the right of the contact to clear them.