 Zimbra for Solaris
I've been dabbling in the Open Solaris community for a year or so now, and I have to say there is some seriously good stuff going on. Getting packaged binaries out there would, it seems to me, be a smart move. Most of the best admins I know are using Solaris 10 in some way. They are (ironically, since they are 'old-school') the new cool kids in this space.
At the same time, it might be best for those of us interested to simply work with Sun Freeware and Blastwave to get this out quickly... | 
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