That was useless. There was almost no useful information for why I would want to use one of them over the built-in Mail.app. What makes one app "dead simple" and another "simple and powerful" and a third "fantastically simple"?<p>If Thunderbird is more customizable than the others, and N1 is customizeable enough for anyone's needs, then what advantage is there to the additional Thunderbird customizeability?