If you use several different mail accounts and folders you have to change folders a lot when you want to check your new mail. It would be nice to have all new messages in one place, regardless of what account or folder they belong to. This sidebar tab should list subject and sender of all unread messages. Could be visible in browser too, so you could read subjects of new mails before leaving the browser.
I looked at bug 87520 before posting this, and though they're related, they are not the same. The main purpose of bug 87520 (if I understood it correctly) is to provide access to mail folders from navigator. The purpose of this bug is to provide access to new mail messages from within mailnews without having to navigate through different folders. I would like a sidebar that lists only new messages, so that when I want to check my new mail I get a neat list of all my new mail without selecting my inbox for my home mail, my bugzilla folder, my work account inbox, etc. As a bonus you could have access to this from navigator as well:) When I have no new mail, this should be empty.
just noting this bug hasn't been resolved to get it off the old-bugs list
-> wontfix The sidebar in mailnews is removed a long time ago