It has been revealed that Longhorn (the next version of Windows or the next wave of Windows technologies, no one seems to really know, even Microsoft!) will include features enabling users to easily subscribe to sites that use the Really Simple Syndication protocol. Microsoft sees RSS is a key technology in the development of the Internet, and as such wants it integrated into Longhorn in a big way. IE 7, the new browser from Microsoft, will also work well with this technology, and will include an orange button on the toolbar, which will light up whenever a RSS feed is posted on a site being viewed with the browser.
They also want to figure out other uses for RSS, not just for use in a browser. Source: Tech Spot.