UEFI Support and Requirements: Microsoft Windows Server Longhorn
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Overview: Windows Server 2008 supports firmware revisions based on the Unified Extensible Firmware Interface (UEFI) Version 2.0 or later specification on x64 64-bit platforms and Intel Itanium platforms. Windows Server 2008 also supports firmware revisions based on the EFI Version 1.10 specification on Intel Itanium platforms. This paper published by Microsoft describes Extensible Firmware Interface (EFI) support in Windows Server 2008 and Windows Vista SP1.