The release of vSphere 5.1 introduces support for Windows Server 2012 on ESXi 5.1, with the following support considerations:
- Installation instruction can be found here http://partnerweb.vmware.com/GOSIG/Windows_Server_2012.html
- Snapshots, checkpoints and VMotion actions for virtual machines with Windows 8 or Windows Server 2012 are incompatible between hosts running ESXi 5.0 Update 1 or ESXi 5.0 P03 with host running later versions of ESXi ( ESXi 5.0 Update 2, ESXi 5.1, etc.). Please refer to KB-2033723 for more information.
- Guest Customization may not complete using vCenter 5.1. Please refer to KB-2037366 for more information.
- vSphere client will use EFI BIOS for VMs configured for Windows 8 or Windows Server 2012 with hardware version 9, however, EFI BIOS is not compatible with the Fault Tolerance feature. Therefore to use Fault Tolerance feature, it is recommended to use Legacy BIOS instead of EFI BIOS.
For more information about software support, please check the VMware Compatibility Guide