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Forumzilla is an extension for Mozilla Thunderbird and SeaMonkey that lets you read news and blog feeds in your email application. It is similar to the feed reader built into Thunderbird, but it downloads stories into any folder in any IMAP, POP, or local account (configurable per feed).
You can manage feeds with all the regular features of Thunderbird/SeaMonkey, like filters, labels, searches, and views. And you can choose to display entire stories or just summaries (configurable per feed).
Forumzilla downloads feeds every 30 minutes or on another schedule you specify (configurable per feed), and you can import OPML feed lists (a.k.a. blog rolls).
It supports all common feed formats (RSS 0.9, 1.0, and 2.0 plus Atom 0.3 and 1.0).
To try it out, go to its listing at addons.mozilla.org and follow the instructions for installing it. After restarting Thunderbird/SeaMonkey, select Feed Subscriptions from the Tools menu (in SeaMonkey, open the Mail window first).