Gnome Mail Icon from top bar shows number of unread email

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http://askubuntu.com – I'm very new to Ubuntu so please bear with me. On the latest Ubuntu (12.04) I have set up thunderbird to read my Gmail account. I know there are browser addons that show you how many unread emails you have, but is there a way I can get this integrated with the Unity Mail icon on the top bar? (HowTos)