If you update an Outlook contact but the old email address keeps showing up in Outlook’s autofill, just follow these steps:

1. When the old email address appears in the autocomplete box, use your up/down arrow keys to highlight the address
2. Press the “Delete” key on your keyboard
3. If you haven’t done so already, finish typing the contact’s name
4. Now press Ctrl+K on your keyboard to load the new email address from your contact list