SLES Minimal Server Appliance for Zimbra on Virtualization Server
I've build the Minimal Server Appliance based on SUSE Linux Enterprise Server 11 SP1 64 bit Just Enough Operating System (JeOS). It has all minimal server package with DRBD+Heartbeat from High Availability Extension (HAE) Addons and all Zimbra requirement package.
The Appliance was successfully tested to running Zimbra Collaboration Suite 7.×.x (last testing with Zimbra 7.1.3) on VMWare ESXi, Proxmox VE, VirtualBox and KVM Virtualization.
Please take a look : Minimal Server Appliance – SUSE Gallery, you may download or clone the appliance project to build your own.