Kudos on the hit navigation feature.
Are there any additional themes or other color choices planned for web access? The amount of white is overwhelming the users. It would be nice to customize the interface further, especially if we could display more of the actual message body by default. For example, in the first screenshot above, we have to scroll down about 40% of the page to finally see that Gertrude says "I am doing" in the message body. On the left we can only see 7 message displayed in that pane. Further to the left we see there are only 7 radio buttons and 9 folders displayed in a space that would normally hold 50. There is just a huge amount of white space and big picture buttons that don't show anything where data could be instead. On larger monitors it's worse and some users are complaining of headaches and eye strain.