The guys from the IE blog report they have adopted the RSS icon used in Firefox.
I’m excited to announce that we’re adopting the icon used in Firefox. John and Chris were very enthusiastic about allowing us (and anyone in the community) to use their icon. This isn’t the first time that we’ve worked with the Mozilla team to exchange ideas and encourage consistency between browsers, and we’re sure it won’t be the last.
We’ll be using the icon in the IE7 command bar whenever a page has a feed associated with it, and we’ll also use it in other places in the browser whenever we need a visual to represent RSS and feeds. Look for more details on the look and feel of IE7 when we post the public pre-release build next year.
More details over here. Additionally, Outlook 12 will also use the same logo.