This article describes the Hyper-V Release Candidate update for Windows Server 2008.

The Hyper-V Release Candidate update to the Hyper-V role provides improvements in security, in stability, in performance, in user experience, in forward compatibility of virtual machine configurations, and in the programming model. All users of the Hyper-V role are encouraged to apply this update.

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Update packages for the Hyper-V Release Candidate

There are two update packages for the Hyper-V Release Candidate.

Update for Windows Server 2008 (KB949219)

This package includes the following items:

•	The updated version of the Hyper-V Manager console and of the Virtual Machine Connection remote connection tool for x86-based versions of Windows Server 2008
•	The updated version of the Integration Services for x86-based versions of Windows Server 2008

To install the latest version of the Integration Services for x86-based versions of Windows Server 2008, you must install this package in the virtual machine and on computers that are running the x86-based version of Windows Server 2008.

Update for Windows Server 2008 x64 Edition (KB949219)

This package includes the following items:

•	The updated version of the Hyper-V role
•	The updated version of the Hyper-V Manager console and of the Virtual Machine Connection remote connection tool for x64-based versions of Windows Server 2008
•	The updated version of the Integration Services for the following operating systems: • Windows Server 2008, x64-based versions only • Windows Server 2003 Service Pack 2 (SP2), x86-based versions and x64-based versions • Windows Vista Service Pack 1 (SP1), x86-based versions only • Windows XP Service Pack 3 (SP3), x86-based versions only

To install the latest version of the Integration Services for x64-based versions of Windows Server 2008, you must install this package in the virtual machine and on computers that are running the x64-based version of Windows Server 2008.

To install the latest version of the Integration Services for Windows Server 2003, for Windows Vista SP1, and for Windows XP SP3, click Insert Integration Services Setup Disk on the Action menu in the Virtual Machine Connection dialog box.

Note On a Windows Vista-based computer, the updated Integration Services are listed in Programs and Features as KB949757.

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Requirements for the update

•	The release version of Windows Server 2008 must be installed on the computer.
•	The "Update for Windows Server 2008 (KB949219)" package requires an x86-based version of Windows Server 2008.
•	The "Update for Windows Server 2008 x64 Edition (KB949219)" package requires an x64-based version of Windows Server 2008.

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How to obtain the update

The Hyper-V Release Candidate is available for download from the Microsoft Download Center or on Windows Update.

Microsoft Download Center

Update for Windows Server 2008 (KB949219), 32-bit versions

Download the Update for Windows Server 2008 (KB949219), 32-bit versions package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=B7464B44-821D-4A7C-9D9C-7D74EC14437C)

Update for Windows Server 2008 x64 Edition (KB949219), 64-bit versions

Download the Update for Windows Server 2008 x64 Edition (KB949219), 64-bit versions package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=DDD94DDA-9D31-4E6D-88A0-1939DE3E9898)

Windows Update
The Hyper-V Release Candidate update packages are listed as an optional update on Windows Update.

Note You must install the "Update for Windows Server 2008 x64 Edition (KB949219)" package on a computer that is running the Hyper-V role before you can apply the package to the Windows Server 2008 virtual machines.

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Hyper-V Release Candidate release notes

To view the Hyper-V Release Candidate release notes, visit the following Microsoft Web site:

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Information about virtual machines that were created on the beta build

If you created virtual machines on the Hyper-V beta build, follow the steps that are documented in the following Microsoft Knowledge Base article:

For more information about Hyper-V, visit the following Microsoft TechNet Web site:

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