GRUB 2 works with EFI but there are no menuentries built, os-prober-efi/30_os_prober_efi will fix this.
os-prober-efi ist for analyzing/printing the EFI environment. Use os-prober-efi -h for more informations!
30_os_prober_efi ist the grub-mkconfig script (update-grub) and generates for each entry (*.efi) found in /boot/efi/EFI/... a menuentry.
You can disable them in "/etc/default/grub".
NOTE: /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi is the regular EFI-Loader for Windows!
Possible...