I have a WHS2011 running as my backup solution in my home network. While it works very well with all my Win7 devices I had to find out that it does NOT support GPT partitions (throws a not very telling VVS error). The "easiest" solution would be to switch from GPT to MBR by saving the whole disk to a image (with ATI2013) delete the partition and setup new ones with MBR and then restore the image backup. But before I do that I wonder if somebody knows if the W8 installation would boot from the MBR disk then. Thanks a bunch :-)
Update January 7th: ACER support states that Windows "needs" the GPT partition and the Secure boot feature which kind of surpises me as I have read that that some users have disabled the secure boot function (after setting a BIOS password) and did not say that W8 wasn't booting any longer.