voilà la liste des OS supportés par Microsoft HyperV R2 avec SP1 pour le dynamic Memory
Windows Server 2008 R2 Enterprise Edition
Windows Server 2008 R2 Datacenter Edition
Windows 7 Ultimate Edition (32-bit and 64-bit)
Windows 7 Enterprise Edition (32-bit and 64-bit)
Windows Server 2008 Enterprise Edition (32-bit and 64-bit)
Windows Server 2008 Datacenter Edition (32-bit and 64-bit)
Windows Vista Ultimate Edition with Service Pack 1 (SP1) (32-bit and 64-bit)
Windows Vista Enterprise Edition with Service Pack 1 (SP1) (32-bit and 64-bit)
Windows Server 2003 R2 Enterprise Edition with Service Pack 2 (SP2) (32-bit and 64-bit)
Windows Server 2003 R2 Datacenter Edition with Service Pack 2 (SP2) (32-bit and 64-bit)
Windows Server 2003 Enterprise Edition with Service Pack 2 (SP2) (32-bit and 64-bit)
Windows Server 2003 Datacenter Edition with Service Pack 2 (SP2) (32-bit and 64-bit)
http://download.microsoft.com/download/E/0/5/E05DF049-8220-4AEE-818B-786ADD9B434E/Implementing_and_Configuring_Dynamic_Memory.docx
Le document avec les informations pour sa mise en place