Comment 38 for bug 376715

I'm assuming the tray icon will keep the current "new mail" notification
functionality? Ideally, the icon could have a hover showing a quick overview of
the state of folders (e.g., read/total messages, like "Inbox 3/20") or subjects
and senders of new mail. PARC and MSR have had a number of research prototypes
with this kinds of notification in the last few years, and I think such features
are really useful.