You can do this with Smart Mailboxes. Mailbox -> New Smart Mailbox, match "all" conditions, then "Date received" "is today." You could then hit the plus sign and add "Message is in Mailbox" if you have more than one account and don't want to automatically do all of them.

Smart Mailboxes are a great way to do all kinds of sorting without actually modifying your mailboxes.

-rob.

Well, you can do that with Mail's rules, I believe. Create a new rule for "Date received" "is less than one day old." Then set the action to "set color of message" and pick the colors you'd like to see.

If you want multiple colors for multiple aged emails, just create more rules -- less than 2 days and more than one day, less than 3 days and more than 2 days, etc., with different colors for each. Note this is theoretical; I've not tried to do multiple color coding, but this works fine for the new messages.

-rob.

True, Dan, true -- you can't replicate the divider line and differing criteria in Mail. However, with Smart Mailboxes and colors, you can do effectively the same thing, albeit with more work.

There's very little I wish Mail copied from Entourage; this feature, along with the three-pane view, are two of them. (And yes, I know there's a three-pane Mail hack, but it's not quite fully functional.)

-rob.