Microsoft introduced UEFI for x86-64 Windows operating systems with Windows Server 2008 and Windows Vista Service Pack 1 so the 64-bit versions of Windows 7 are compatible with EFI. 32-bit UEFI was originally not supported since vendors did not have any interest in producing native 32-bit UEFI firmware because of the mainstream status of 64-bit computing.[44] Windows 8 includes further optimizations for UEFI systems, including a faster startup, 32-bit support, and secure boot support.[45][46] There do appear to be some issues with Windows 7 machines not properly supporting the use of MBR as data disks as per Microsoft's own implementation specifications[citation needed]. The typical behavior is a refusal to recognize the presence of any operating system to boot from.