Just a minor one really...
When reading pages of emails on the server direct there is the very useful jump to page facility but (as far as I can see) no facility for "NEXT" or "PREVIOUS" "LAST" "FIRST" page full of email listings? Nor the opportunity to display say 50 to a page instead of X amount.
Also whilst I think of it The "read email" link is in fact very similar in colour and size to the rest of the text and unless you look closely or know its there it is easy to miss it. In fact many of the links fall into that category quite often I haven't realised something or a feature is there just because it is so well camouflaged.