This may be documented somewhere but I didn't see it. If you are composing an email and type in the first couple of letters of a persons first or last name in the To, CC or BC box, it will normally fill in the first match. However, I found out through a 'what happens if' moment, that if you hit Control-Enter, it will popup a list of all matches for you to choose from. I didn't see this in the Help file. Using the 8.0.2 client.