Visually distinguish between individuals and groups

Edited on 12/11/09
In the address book, Thunderbird makes no graphic distinction between groups (or lists) and individuals. Outlook Express (which I have used for years) has groups displayed in a slightly heavier and larger font and assigns to groups a slightly different icon than individuals. Therefore, when you compose an email and click to choose the addressee, it is very easy to distinguish between groups and individuals. You can find who you want to send to very quickly. Until Thunderbird does the same, I'm not going to switch (but I would like to).
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The company has this under consideration.

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