Only Windows 8 Pro can join a Windows domain and take advantage of the dozens of new group policies that are exclusive to Windows 8.
BitLocker Drive Encryption offers strong encryption for entire drives, with the encryption secured by a password or a smart card. To encrypt the system drive, the PC must have a Trusted Platform Module. BitLocker To Go is ideal for USB flash drives and doesn't require any extra hardware.
BitLocker To Go was previously only available in Ultimate and Entrprise Windows editions. With Windows 8 it will be available with the mainstream business SKU, Windows 8 Pro.
If you forget the password for a flash drive protected by BitLocker To Go, your data is lost for good. Unless you can come up with a recovery key, that is. Windows 8 builds in the option to save the recovery key to your SkyDrive account, where it's secure but readily accessible.
When you plug a BitLocker-encrypted flash drive into a Windows 8 PC, this Metro style dialog box prompts you to enter the necessary credentials to unlock the data. (BitLocker To Go is also compatible with Windows 7.)
Creating a virtual hard disk takes literally seconds. Windows 8 adds a new VHDX format and the ability to mount the VHD file by double-clicking.
After creating a 20 GB VHD flle and mounting it, the virtual disk appears to Windows just like a physical disk. After attaching this drive, I installed Windows 8 on it. The setup program automatically added the new installation to the boot menu.
Hyper-V was previously a server-only feature. In Windows 8, this powerful feature replaces the wimpy virtualization tools that previous Windows desktop versions had to suffer through. This installation has installations of Windows 7 and 8. You could also run a server version of Windows, resources permitting.
The best thing about virtualization is that a virtual hard disk can be copied from PC to PC and attached to new VMs using this wizard.
The wizard makes it relatively easy to set up a new VM. Use this extremely dense settings dialog box to fine-tune memory, hard disk, network, and other settings.
Just as with previous versions of Windows, the ability to set up a Windows 8 PC as a Remote Desktop host requires the Pro version.