Hi there!
Just seconds ago I discovered a Firefox plugin that cause me to shout ‘wow’! It’s called IE Tab. What it does?! The extension is derived from the famous extension IE View, but instead of opening a new IE window, this extension opens the IE window in Firefox. Sounds great, not (consider Exchange 2003 and Exchange 2007 just to mention something )?! The extension’s website is located here (or you can download it directly from the Mozilla website: click).
Cheers!