Can’t be much more descriptive than that. Check the release notes here.
- Not all combinations of VirtualCenter and ESX Server versions are supported and not all of these highlighted features are available unless you are using VirtualCenter 2.5 Update 4 with ESX Server 3.5 Update 4. See the ESX Server, VirtualCenter, and VMware Infrastructure Client Compatibility Matrixes for more information on compatibility.
- This version of ESX Server requires a VMware Tools upgrade.
The following information provides highlights of some of the enhancements available in this release of VMware ESX Server:
Expanded Support for Enhanced vmxnet Adapter — This version of ESX Server includes an updated version of the VMXNET driver (VMXNET enhanced) for the following guest operating systems:
- Microsoft Windows Server 2003, Standard Edition (32-bit)
- Microsoft Windows Server 2003, Standard Edition (64-bit)
- Microsoft Windows Server 2003, Web Edition
- Microsoft Windows Small Business Server 2003
- Microsoft Windows XP Professional (32-bit)
The new VMXNET version improves virtual machine networking performance and requires VMware tools upgrade.