I agree with what fossfreedom said above.
Note that while the packages are on Ubuntu repositories, Zentyal encourages the usage from their repositories, but it's a strictly Ubuntu-based tool. I think that AskUbuntu could is a reasonably fit for many Zentyal packages questions.
But then, in addition, Zentyal Community also has a support forum (http://forum.zentyal.org).
I personally like StackExchange interface a lot, but Zentyal forums have a wider scope. I guess that people will just normally use the tool of their choice in order to ask questions. I don't know if this situation is desirable, or if anyone has suggestions about how to deal with these cases.
(Disclaimer: I'm a former user, and now part of Zentyal, also a user and fan of AskUbuntu and StackExchange sites).