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20 1 Windows Server 2008 Hyper-V Technology Primer Standard, Enterprise, and Datacenter versions of Windows 2008 (not on Web Server), and it runs only on the x64-bit version of Windows. NOTE Technically, Hyper-V also runs on the Itanium version of Windows 2008 and provides the ability to run 32-bit Itanium guest sessions. From the experience of the authors of this book, however, Itanium-based virtualization is rarely implemented. Most organizations implement the x64-bit version of Hyper-V to support standard 32-bit and 64-bit applications. Therefore, this book makes very little reference to and spends very little time addressing the Itanium version of Hyper-V. From a licensing standpoint, Microsoft. | 20 1 Windows Server 2008 Hyper-V Technology Primer Standard Enterprise and Datacenter versions of Windows 2008 not on Web Server and it runs only on the x64-bit version of Windows. NOTE Technically Hyper-V also runs on the Itanium version of Windows 2008 and provides the ability to run 32-bit Itanium guest sessions. From the experience of the authors of this book however Itanium-based virtualization is rarely implemented. Most organizations implement the x64-bit version of Hyper-V to support standard 32-bit and 64-bit applications. Therefore this book makes very little reference to and spends very little time addressing the Itanium version of Hyper-V. From a licensing standpoint Microsoft allows organizations to purchase and use Windows 2008 at a lower cost with a version of Windows 2008 x64-bit that does not support HyperV. This version is more likely purchased by an organization using a virtualization product from a third-party vendor and not planning to use the Hyper-V capabilities. Windows Server 2008 x64-bit Enterprise Edition Windows Server 2008 x64-bit Enterprise Edition is the most common version of Windows purchased for a Hyper-V host server for virtualization. The x64-bit version is needed to support both 32-bit and 64-bit guest sessions and provides the ability to support up to 2TB of RAM. NOTE A Hyper-V host cannot run on the 32-bit x86 version of Windows Server 2008. For the Hyper-V role to show up on the server for installation the host server must have the x64-bit version of Windows Server 2008 installed. Microsoft is licensing the Enterprise Edition of Windows 2008 in a manner that allows an organization to run up to four guest sessions on the server without the need to purchase additional Windows server licenses. So effectively an organization can purchase one Enterprise Edition of Windows 2008 and run four Windows 2008 Enterprise Edition guest sessions for free. NOTE The Windows 2008 Enterprise Edition provides licensing support for four guest .