Are we talking about Outlook 2000? If so, NO it will not 'Autocomplete'. It will auto-suggest however if you just type the first 3 or 4 letters of the name, you'll see a red wavy line. You can click on the name for the choice list or if you just finish your message, when you click 'send' you'll be prompted to pick the recipient from the possible choices. (If there's only 1 possible choice, it will just send).