@Jeckill13
Here we are talking about another function.That of writing in T9 (as on the old Nokia for SMS with the keyboard) the name of the person we want to contact, so that his number.Windows Mobile 2003 already did it, and it's just super useful!
You are looking to join "Marco" in your address book, and well instead of looking for his file, just compose 62726 and Marco will appear with his number!;)