When going to View->Show/Hide->Component Bar, so that the component bar should disappear. It only disappears from the main browser window. In the Mail and Newsgroup window it is still there in the status bar. In the Composition Editor it's still there in the status bar and in the Address Book, it's still there in the status bar. I don't know what the intensions were with the Component Bar. May be you want the option in every 'component'.. but as a user I'd find that annoying to have to turn it off in every single different component. It'd be nicer if the Component Bar option was global. May be there needs to be two options? Two options would make it more confusion though.
*** This bug has been marked as a duplicate of 83059 ***