Microsoft introduced UEFI for x86-64 Windows operating systems with Windows Server 2008 and Windows Vista Service Pack 1
The Linux kernel has been able to use EFI at boot time since early 2000,
HP-UX has used (U)EFI as its boot mechanism on IA-64 systems since 2002.
HP OpenVMS has used (U)EFI on IA-64 since its initial evaluation release in December 2003, and for production releases since January 2005.