Yeah, since Firefox has been gaining on IE, I expect MS will put alot of the nicer features from firefox that set it apart from IE. I'm not bashing IE in any way though.....and we have to keep in mind that ONE of the reasons IE has so many security issues is because it's the most widely used browser.
I've also switched to Mozilla Thunderbird. I prefer it to Microsoft Outlook (which I've used for years) or Outlook Express. The only thing I miss is the calander functionality of Outlook, but I downloaded a standalone beta of Mozilla Sunbird and it's seems to work pretty well.