By now there are no of RSS readers, that are independent applications to manage RSS feeds, there are some real nice ones, but for the sake of making things simple, it makes more sense that the existing email client manages all of the news related stuff, so in addition to having your news reader built into your favourate email client it also makes sense to integrate RSS feeds to be read by the news client.
I have come across no of RSS readers for outlook and all of them work and operate the same, so why not go for a free one.
Here are links to two of the free RSS readers that get integrated into Microsoft outlook.
If you still fancy some shareware RSS plugins for Outlook then here are the links to two of them
Also if you like to use independent RSS readers, then there is a good collection of links on the download.com site.