Adam, I don't know the answer to your question... the only IMAP accounts I have are my gmail account and my .mac account... the others are all POP but all of the accounts display the same and act the same, except of course the IMAP accounts function like an IMAP account and sync automatically with my iphone etc.
Krystle, I could give you some pointers, but it's really simple to set up. Once you create folders, creating rules is SO intuitive, I bet you can find a tutorial on apple's website that will go into much more detail than I can.... and yes, you can either have rules automatically move/copy messages to folders and mark them as read, or un-read. I have mine do all sorts of things like change colors, mark as read, keep in my inbox and copy to a folder, move to folders, delete automatically, all sorts of things.... and I probably don't know half the things that apple mail can do!
Here's a very simplified start on creating rules:
http://docs.info.apple.com/article.html?pa....0/en/9909.htmlif you go to
http://www.apple.com/support and go to the top left side of the page, type in "mail rules" in the search box to search the support site for articles on using rules. Feel free to post if you have any questions though. I'll do my best to assist.