Zimbra is a groupware system that provides email, calendaring, integrated antivirus and spam filtering, and more for multiple domains. Available in several editions, these guides will help you get the Open Source Edition installed on your Linux VPS.
Getting started with the open source edition of Zimbra groupware on your CentOS 5 Linux VPS.
Install Zimbra OSE 8.6 on Ubuntu 14.04 LTS Linode