Let me preface this by telling you how I manage my Address Book. I do not like names to be listed like "Jones, Bob" I like it to just say "Bob Jones". So in Address Book I put "Bob Jones" into the First Name field and leave the Last Name field blank. So everytime I launch Mail to send a few emails my Address book gets messed up. For example, if I email Bob Jones his name in my Address Book becomes "Bob Jones Jones" with the last name field now filled in. Has anybody else experienced this problem?