Hyper-V RC1 for Windows Server 2008 64-bit must be installed on physical machines, and once installed it cannot be uninstalled to return to an earlier release candidate or beta versions.
The RC has Hyper-V server components for full and Server Core installations, as
The release candidate has new graphics for Hyper-V Manager and Virtual Machine Connection. There are also new IPv4 settings for creating a virtual network bound to an adapter with a static IPv4 address. These settings migrate to the new virtual adapter, and integration components for Windows Server 2008 guests are now included in the integration services setup disk.
Microsoft has a lot of confidence in its server virtualization software. At Synergy, the Citrix Systems conference in Houston this week, Bob Muglia, Microsoft's senior vice president told Citrix customers that Hyper-V is "rock solid stable, rock solid ready for production," and that everything at Microsoft is running on Hyper-V.
Microsoft plans to release Hyper-V with Windows Server 2008 to the general public in August, although the vendor has hinted that it may be sooner. The current release candidate is available on Microsoft Download Center.