You can deploy an OVF template that contains Symantec Brightmail Gateway Virtual Edition on a VMware ESX Server 4.0 or VMWare ESXi Server 4.0. An OVF template is a virtual machine that includes the software you plan to run on the machine. To deploy the OVF template, you can use a VSphere or VCenter client on a different computer than the computer hosting your ESX or ESXi Server.
If you intend to deploy on an ESX 3.5 or ESXi 3.5 Server, you must use the VMware vCenter Converter.
If you cannot successfully complete this procedure, you can instead use an OS restore disk
To deploy an OVF template on an ESX 4.0 or ESXi 4.0 Server