IE7 RC1 can't update Password Protected Feeds
Scott found out that IE and Outlook won't work on authenticated feeds.
The argument that there aren't a lot of authenticated feeds is very silly. We have authenticated feeds in our company, and probably a lot of companies do. They are not public. Nobody sees them but us.
Not supporting authenticated feeds restricts the use of RSS only to public feeds and seriously limits the scenarios where you can use RSS for enterprise apps. If we want to make RSS the Internet publish/subscribe backbone, then we need good support for authentication.
I was eager to use Outlook as my main RSS client application, but it looks I'll need to look somewhere else...