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Been about a year and I honestly cant recall. There is a guide that I had bookmarked here: https://www.digitalocean.com/community/tutorials/how-to-install-zentyal-on-ubuntu-14-04
But for my needs I found that Zimbra open source edition met my mail needs with the minor added cost of ZeXtras Mobile which adds ActiveSync for phones and newer versions of Outlook. So I never contnued with Zentyal beyond initial tests and product comparisons. https://www.zimbra.com/downloads/ https://www.zextras.com/pricing/