I agree with Zaf...
Corporate organizations will have one of two scenarios. If they pay for Linux, they will be RH. If they don't pay for Linux they have the expertise to compile on their own.
I'd love a Debian release, because that is what I prefer (free and easy). But I am willing to compile on my own so the developers can concentrate on features instead of platforms. Don't we want Zimbra to be more "feature-rich"?
In fact, die-hard users can create platform packages as they have with Debian. I can download and install a Debian package today if I want to accept the options that are compiled by the person that submitted the Debian package.
I choose to do it myself... That's just the way I am.
BTW- I just voted for Debian even though I compiled it myself.
Tomas, Ph.D.