RSS Feed IE10 vs IE11

Hi, hopefully this is the correct section. We're facing an issue with RSS feeds displaying via the feed reader view in IE10 but working fine in IE11.

http://bit.ly/1qoIq1X

The above displays with the RSS feed reader view in IE11 but not in IE10. I've tried changing the namespace from a10 to atom and also tried changing the format from rss2.0 to atom1.0 but that didn't work either.

Is anyone please able to tell me why this might be? Am I missing a required tag or something?

Information that might be handy:

• Its hosted in SharePoint2013
• The RSS xml is generated via a custom webpart we wrote, it uses the SyndicationFeed class

Compare it with another RSS feed: http://zd.net/1pbf4Vw that works in both IE10 and IE11

Any help would be much appreciated.