I wish that instead of a little flag icon to designate follow up times/events/messages, you use a highlight color for the actual email mess
When I want to flag an email for followup, I select task and the color icon appears at the lower right side of the screen. I almost never do anything about the follow-ups since I don't look at that little box. I'd rather like to see the whole email message highlighted in the inbox. then I would follow up, because I would see it.