The RSS feeds are now correct in that I have tested them via an RSS Validator and fixed up the issues so that they pass. Also there was a problem with RSS authentication (fixed in Community 3.4.c coming soon). So a couple of little issues.
What is not fixed, is that Outlook just doesn't like a lot of RSS feeds, I tried a number of public ones and it only seemed happy with a few of them, I don't know why. Other RSS readers like Thunderbird and also the browsers themselves work fine with the feeds.
Kev