Our Zealbox Z20.11x server is listed in the VMware Compatibility Guide

VMware certified Z20.11x 1U server

The Zealbox Z20.11x 1U rackmount server has been successfully certified with VMware ESX and ESXi for the release 4.1.

The listing in VMware`s Compatiblity Guide can be found as of now.

More info: Zealbox Z20.11x Server