I don't own Outlook, and I don't use Outlook Express. Thunderbird is my only email program that I use. Any non-podcast RSS feeds are loaded in Thunderbird, as well. No regrets.
...does everyone have the same enthusiasm about Thunderbird?
I was just curious if everyone is just as enthusiastic about Thunderbird? I use it alongside Outlook. I have my main email account in Outlook and I use the calendar. I have three other email accounts in Thunderbird and I use the RSS reader with about 7 feeds.