If the same question is asked so many times and it makes it silly to keep answering it over and over. We have no issue answering the question 1, 2, or even 3 times as maybe there is something we can learn. Once it's clear there is a pattern and people are generally too lazy to even search a little you have to draw the line. We have no problem helping folks who come here and say hey 'I searched for X and found Y which doesn't answer X can you help me'. That's tell us the person has a clue and at least tried to help them self.
There are Google searches that will get you the answer:
http://www.google.com/search?q=zimbra+documentation http://www.google.com/search?q=zimbr...t+installation
All of these lead you right to the docs with this link to a document called 'Quick Start Guide':
http://www.zimbra.com/pdf/Zimbra%20C...ck%20Start.pdf