So this seems to have been mentioned before (linky), but did not seem to get any traction. Sorry if I shouldn't be making a similar post, but this is something that I think would be important to add.
I would like for messages to be marked as read or unread and for them to be stylized differently to be easily distinguishable from each other. Here is a screenshot of my inbox (usernames, messages, and thread titles hidden for privacy's sake). The first three messages are unread and the following two are read, but there is no clear way to tell them apart without checking their dates. If I was less of a lurker and received responses more often, I would have a hard time telling them apart just by their date.
I know there are probably more important things on the list of things to implement for the site, but I wanted to be sure this isn't forgotten! Thanks.