If we could set up RSS feeds in Outlook.com, it would sync with every device I use, and articles I've read, would be marked as read on all my devices. So I could easily switch between my Windows Phone, Outlook at work, Outlook at home, and Outlook.com (when I'm on someone else's computer). This way, I won't miss anything and won't waste time scanning over stuff I've already read.
Plus, having RSS feeds in Outlook.com means you can quickly find any previous article you've received because they are all indexed. It also makes it very convenient to "forward" articles. Instead of forwarding a link, your recipients receive part of the article, including images up top.