When you subscribe to an RSS Feed, Outlook periodically checks the RSS publisher's server for updated postings.
I can right click and "Refresh All" and they do update, but just that one time.
You can configure Outlook to automatically download the linked content as an attachment to the RSS messages.
After you add a Really Simple Syndication (RSS) Feed, you do not have to change any other settings.
For details on the RSS Platform User-Agent string in IE7 please take a look…
When an RSS Feed is broken in Microsoft Outlook, the easiest way to repair is to recreate it. Microsoft Outlook 2007 experienced continuous problems with RSS Feeds; however, this appears to have been resolved in Outlook 2010. Select the web address, and press "Ctrl" and "C" on the \ keyboard to copy the URL.