I have a confession to make. It took a great long while before I realized that the Thunderbird icon in my quickstart tray was not a little envelope with blue hair.
An envelope with hair?! "Why would they make the icon an envelope with hair?" you are likely thinking. Well, I don't know. It never occurred to me that an envelope with blue hair wasn't a brilliant plan for an e-mail client icon. I'd even seen the fullsize icon and not made the connection.
I'm a little slow.