> we're planning to add lightning-fast searching<p>I don't see the point of discussing a mail client that doesn't have fast full-text search that scales to a million messages. If it wasn't designed in from the beginning, why should we have any confidence that it will actually work, when so many still fail to deliver? I use Gmail and Notmuch, both of which I think are best in class, yet are still only <i>barely</i> fast enough.