Just as with Windows 8, pre UAG 2010 SP3 Rollup 1, the UAG portal does not appear to be compatible with Windows 8.1 and Internet Explorer 11.
Is there an upcoming Service Pack or Rollup that will be released to add compatibility for these new platforms? If so, what is the timeline for these releases?
My organization is on the cusp of a Windows 8.1 deployment and this is one of the items delaying the effort.