actually - your now false-quoting me... (ergo: making me say things that i have not said)...
im not saying that zentyal is a bad idea, i saying that there is a reason other than, being the best possible, most configurable, management interface out there, witch is user friendlyness, because however virsatile the /etc/ is its not verry easy to use and getting a clear view on what you are trying to accomplish is near to imposible for non geek users... so building zentyal as it is today is perfectly valid, and the fact that im here should say that i agree to it and support it all the way.
seccondly your saying there there are a lot of ubuntu's witch absolutely is NOT true, there is only 1 ubuntu and that is ubuntu, all the others like xubuntu kubuntu lubuntu mediabuntu xbmcbubtu linux mint and probably a few i have forgot to mention are all spinn-offs not supported by cononical, they are supported and maintained by 100%-nonprofit-opensource communities, and the only support they get from cononical is that IF the packages are stable enought they can be included in the main repository. and if not, they should maintain their own (ppa).
thats it there is not officially supported kde version of ubuntu there has been for many years but even cononical understood that it created to mutch overhead so they stopped it... speeking about it kubuntu had allways been a farce anyway, it was never as good (finetuned and developed) as the gnome version, project like suse, did a mutch better job in creating the perfect kde-based desktop experience...
next you say that, ubuntu supports so many applications in its app center, and your just about right, but did you ever get a canonical subscription, and did you ever try to get support deploying and managing openbox desktops ... instead of unity. what you where trying to make me say is that
openoffice is to ubuntu, what captive-portal, samba4 or the network-module are to zentyal. and again thats simply not true... these are core-components to a zentyal server, just like the ubuntu software center, unity, or aptitude are core ellements of ubuntu...
sure you can replace apt with yum, but you could hardly speek of it as ubuntu can you?
from the last but not least part of your argument, im really suspecting a bunch of FUD here.
you claim that zarafa isn't part of a core smallbuisyness network, but how can you say that as increasing number of offices try to become paperless, so email, shared documents, calendars and addresbooks etc become ever more important. yest you can argue that zarafa can be replaced by phpgroupware/e-groupware zimbra or openchange. but that is a buisiness discussion, and in my opinion if you have problems with it, or dont whant it should be your stake on the negotiation table when trying to get a larger discount from ebox, for your client, and should not be part of the community debate, not untill moving zarafa away from the core is a logical next step that suits everyone, not just your own buisiness plan.
you say that its chicken and egg, i say that it is, fighting a war that hasn't even been started yet... are you actually going to use nuclear weapons on india just because in a vision (premenition) you saw that the next great hitler might be born there in 50 years from now? - i hope not...
if you want to add new zentyal modules like e-groupware go ahead register for a launchpad account
here and create your own ppa your packages will be very easy to install from there...
update: correcte some spelling