![Microsoft lync 2010 download 64 bit](https://cdn1.cdnme.se/5447227/9-3/24_64e61dfd9606ee7f8b257167.png)
I can get further information through rEFIt if needed. How can I reliably check the EFI version of the machines? What is funny is that rEFIt reports again the same EFI version 1.1 and build as before on the 2015 Mac.!! When choosing BOOTX64.efi from rEFIt it freezes.!!? My MacBookPro11,5 boots the stick from Apple Boot Selector Screen and enters setup correctly. Using rEFIt on a stick, the MacPro5,1 reports the same EFI version and build. I tried the same installer and a unmodified DVD ISO on (native, not upgraded) MacPro5,1 and at least came to a blue windows screen with boot error 0xc0000225. Unfortunately the machine freezes after choosing EFI Boot from Windows installer.
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The machine has a 64Bit EFI (rEFIt reports version 1.1 - build 20070328 in the EFI shell using command "ver"), Windows 8 and Windows 10 installer should be downwards compatible from EFI 2.x and should work with EFI Version 1.x as I read somewhere during my extensive research. I would like to install Windows 8.1 or 10 on a separate single SSD disk in my MacPro4,1 (not yet flashed to MacPro5,1) using only
![Microsoft lync 2010 download 64 bit](https://cdn1.cdnme.se/5447227/9-3/24_64e61dfd9606ee7f8b257167.png)