The cat's officially out of the bag. Microsoft is building RSS support into Longhorn. Specifically, it is adding a common feed list, common data store and synchronization engine, allowing Longhorn applications to be able to consume RSS feeds, into the next version of Windows. Microsoft also is building RSS support into Internet Explorer 7.0 (both the version integrated in Longhorn and the one that will run on XP). And the company is extending the RSS spec with a "list" extension, enabling users to syndicate new kinds of content (music play lists, photos, Amazon.com wish lists, calendar info, etc.). Longhorn testers won't get the RSS-ready Longhorn build until the Professional Developers Conference in September. IE 7.0 Beta 1 will support RSS feeds, however, according to Microsoft.