Usefulness of enterprise headers

Hi!

I just switched to KDE 4.2 and wonder what those enterprise headers are in 
favor to the fancy headers?

Just eye candy? Or are they useful for something?

I mean they look fresh. IMHO they would be somewhat cool, when the letter 
would symbolize the MUA the other side used, like Thunderbird[1].

I think the rendering is broken, too, see attachment.
I'm using  kmail 1.11.0, KDE 4.2.00 on archlinux

Bye...Frank

[1] https://addons.mozilla.org/thunderbird/addon/562

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