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You would need Ubuntu server; are you looking at the Community or Network Edition of Zimbra ? As a high majority of the documentation is written for RedHat you may wish to use CentOS. A lot of us already do
Quote: Taken from CentOS site www.centos.org - The Community ENTerprise Operating System
CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by a prominent North American Enterprise Linux vendor. CentOS conforms fully with the upstream vendors redistribution policy and aims to be 100% binary compatible. (CentOS mainly changes packages to remove upstream vendor branding and artwork.) CentOS is free.