I'm using a retina Mac book pro, and using virtual box.
How can I use the high resolution(2560*1600) in a windows 8.1 guest OS ?
Thanks.
EDIT:
Be more clearly, I have already installed the guest addons, and set the video memory 128MB, but in the guest os(windows 8.1) the highest resolution is still 1440*900, in mac os I have 2560*1600 resolution on the retina screen.