• You can also find Windows Server and Client updates, virtualization KBs and useful tools here as well:

• 957311 Recommended hotfixes for Windows Server 2008-based server clusters
  http://support.microsoft.com/default.aspx?scid=kb;EN-US;957311
• 958124 A wmiprvse.exe process may leak memory when a WMI notification query is used heavily on a Windows Server 2008-based or Windows Vista-based computer. http://support.microsoft.com/default.aspx?scid=kb;EN-US;958124
• 954563 Memory corruption may occur with the Windows Management Instrumentation (WMI) service on a computer that is running Windows Server 2008 or Windows Vista Service Pack 1. http://support.microsoft.com/default.aspx?scid=kb;EN-US;954563
• 959766 Windows Server 2008 Hyper-V systems restart unexpectedly, and you receive a 0x1000007E Stop error code when you mount a VHD file. http://support.microsoft.com/kb/959766
• 956697 Windows Server 2008 Hyper-V VSS writer is not used during a backup job because of corrupted or invalid virtual machine configuration files http://technet.microsoft.com/en-us/library/dd430893.aspx
• 958065 You cannot configure a Hyper-V virtual machine by using Windows Server 2008 Failover Clustering when the virtual machine uses a storage device that is managed by a third-party clustered file system or a third-party replication solution.
  http://support.microsoft.com/default.aspx?scid=kb;EN-US;958065
• 959962 An update is available for Windows Server 2008-based computers to address issues with backing up and restoring Hyper-V virtual machines. http://support.microsoft.com/kb/959962
• 961661 Video performance may decrease when a Windows Server 2008-based computer has the Hyper-V role enabled and an accelerated display adapter installed. http://support.microsoft.com/default.aspx/kb/961661
• 961804 Creating or starting a Hyper-V virtual machine on Windows Server 2008 or Microsoft Hyper-V Server 2008 may fail with error: 0x800704C8. http://support.microsoft.com/default.aspx/kb/961804
• 950792 When you try to enable, disable, or update Hyper-V technology, the process stops responding. http://support.microsoft.com/kb/950792
• 958664 Windows Server system software that is not supported in a Hyper-V virtual machine environment. http://support.microsoft.com/kb/958664
• 299631 Failover behavior on clusters of three or more nodes. http://support.microsoft.com/default.aspx/kb/299631
• 833167 A Volume Shadow Copy Service (VSS) update package is available for Windows Server 2003. http://technet.microsoft.com/en-us/library/dd430893.aspx
• 958662 How to back up Hyper-V virtual machines from the parent partition on a Windows Server 2008-based computer by using Windows Server Backup http://support.microsoft.com/default.aspx/kb/958662

Tools

• Remote Server Administration Tools for Windows 7 and Windows Server 2008 R2: http://www.microsoft.com/downloads/details.aspx?FamilyID=7d2f6ad7-656b-4313-a005-4e344e43997d
• KB890830 Microsoft Windows Malicious Software Removal Tool. http://www.microsoft.com/downloads/details.aspx?FamilyId=AD724AE0-E72D-4F54-9AB3-75B8EB148356
• KB941314 Microsoft Remote Server Administration Tools for Windows Vista. http://www.microsoft.com/downloads/details.aspx?FamilyID=9ff6e897-23ce-4a36-b7fc-d52065de9960

You can also find SCVMM updates here: http://blogs.technet.com/jonjor/archive/2008/12/29/updates-updates-scvmm-hyper-v-cluster.aspx

• 962941 Recommended hotfixes for System Center Virtual Machine Manager 2008 http://support.microsoft.com/kb/962941
• 956589 Description of the Hyper-V update for issues that may occur when you manage the Hyper-V role on the 64-bit editions of Windows Server 2008 by using SCVMM
  http://support.microsoft.com/default.aspx?scid=kb;EN-US;956589
• 956774 A Background Intelligent Transfer Service (BITS) client cannot handle files that have paths that contain the volume GUID in Windows Server 2008 or in Windows Vista
  http://support.microsoft.com/default.aspx?scid=kb;EN-US;956774942372 When you try to create a template from a Windows Server 2003 Service Pack 2-based virtual machine in System Center Virtual Machine Manager 2007, the job fails. http://support.microsoft.com/default.aspx/kb/942372
• 942372 When you try to create a template from a Windows Server 2003 Service Pack 2-based virtual machine in System Center Virtual Machine Manager 2007, the job fails. http://support.microsoft.com/default.aspx/kb/942372
• 954563 Memory corruption may occur with the Windows Management Instrumentation (WMI) service on a computer that is running Windows Server 2008 or Windows Vista Service Pack 1. http://support.microsoft.com/default.aspx?scid=kb;EN-US;954563
• 958124 A wmiprvse.exe process may leak memory when a WMI notification query is used heavily on a Windows Server 2008-based or Windows Vista-based computer.
  http://support.microsoft.com/default.aspx?scid=kb;EN-US;958124
• 955805 Certain applications become very slow on a Windows Server 2008-based or Windows Vista SP1-based computer when a certificate with SIA extension is installed
  http://support.microsoft.com/default.aspx?scid=kb;EN-US;955805
• 956697 Windows Server 2008 Hyper-V VSS writer is not used during a backup job because of corrupted or invalid virtual machine configuration files
  http://support.microsoft.com/default.aspx?scid=kb;EN-US;956697
• 959978 Error message when you back up a Windows Server 2003-based virtual machine on a Windows Server 2008 Hyper-V-based computer: "GetWriterStatus FAILED for Selected writer [Microsoft Hyper-V VSS Writer], writer is in state [9] [VSS_WS_FAILED_AT_FREEZE]"
  http://support.microsoft.com/default.aspx?scid=kb;EN-US;959978
• 958184 Virtual machine backup operations fail in Windows Server 2008 when Hyper-V virtual machine files are saved on a volume that is mounted on a failover cluster by using a volume GUID. http://support.microsoft.com/default.aspx?scid=kb;EN-US;958184
• The System Center Virtual Machine Manager (VMM) 2008 Management Pack for System Center Operations Manager 2007.
  http://www.microsoft.com/downloads/details.aspx?FamilyID=d6d5cddd-4ec8-4e3c-8ab1-102ec99c257
• 961983 Hotfix Rollup package for System Center Virtual Machine Manager 2008: April 14th, 2009
  http://support.microsoft.com/kb/961983/en-us
  • Supersedes 959596 Description of the System Center Virtual Machine Manager 2008 update to address physical to virtual (P2V) issues
    http://support.microsoft.com/kb/959596

You can also find VirtualPC and Virtual Server Updates here:

• 956124 Microsoft Virtual Server 2005 R2 SP1 Update. http://www.microsoft.com/downloads/details.aspx?FamilyID=886876b7-e17c-4429-85da-f623506c5f2c
• 941125 The Virtual Server service may stop responding when the service is starting if one or more of the virtual machines are configured to automatically start when the Virtual Server service starts. http://support.microsoft.com/kb/941125

You can also DPM/VSS Updates here:

• 960038 You receive a "0x0000007E" Stop error on Windows Server 2008-based computers that host Hyper-V virtual machines when you use the Hyper-V writer to back up virtual machines. http://support.microsoft.com/kb/960038
• 959962 KB959962 is scheduled to release in January 2009, it enables online protection of Hyper-V guest machines. Until the update is available, virtual machines can be protected by configuring them for offline backup within each machines’ Integration Components service settings. Open the Settings window for the virtual machine and select Integration Services in the left pane. Clear the check box for Backup (volume snapshot) service and click OK. If you have set the DWORD AllowOffline registry key under HKEY_LOCAL_MACHINE\Software\Microsoft\Microsoft Data Protection Manager\Agent make sure the value is not zero (0).. http://technet.microsoft.com/en-us/library/dd347840.aspx
  

Is a roll-up list like this useful? Would you like to see it for other products? Which ones? Does the "Required?" column add value? Leave us feedback here. Thanks in advance.

The note at the top about SP2 is very confusing. It says 'All updates marked “SP2” are applied with SP2' whereas the column heading says "Applies to". So, is fix KB957967 for example (marked SP2 in the Applies to column) included in SP2 or does it apply to a system that has had SP2 installed? i.e. If I have SP2, do I need this hotfix or not? If I need it, surely the "Applies to" column should say pre-SP2 or something similar.

Here are the Hyper-V updates that will update on the next publication cycle for this page:

• KB963709 "The AltGr key does not work on a Linux virtual machine on a Windows Server 2008-based server that has the Hyper-V role enabled”
  http://support.microsoft.com/kb/963709
• KB967902 "You cannot connect to a virtual machine when the Windows Server 2008 Hyper-V VMMS certificate has expired”
  http://support.microsoft.com/kb/967902
• KB972045 "Slow system response together with many other performance issues occur on a virtualization server that is running Windows Server 2008 and that has the Hyper-V role installed". http://support.microsoft.com/kb/972045
  
  

The page that lists all the updates above that are included in SP2 is at: http://technet.microsoft.com/en-us/library/dd335033(WS.10).aspx, or you can DL the excel spreadsheet at: http://go.microsoft.com/fwlink/?LinkId=143706