In email or SMS, I'd been able to bring up smileys, frowns, etc, but seem to have forgotten how, or somehow lost this functionality.

When composing a message in Outlook, I press Alt, which brings up the Alt Keys window, with the colon highlighted. Somehow, I'd then get a window with the smileys, I believe by pressing Opt and the middle button of the 5-way. But now it's not working for me, or I've forgotten the correct key combination. Can someone help me with this?