The new version of virtual box seems to have improvements on the native graphic resolution. My guest OS screen now fits into entire screen of host OS rather than it was limited to a specific area in earlier versions. This was happening even if guest add-ons were installed. The problem seems to have gone by now. Now I am getting real feeling of linux box on vista without installation of guest additions. I recently installed OpenSUSE 12.1 32 bit edition with XFCE desktop as guest on top of Vista and looks magnificent. Here are some screen shots
That really looks nice. Of-course this was only for experiment. Personally I use linux installed onto the hardware system :-).
|FULL SCREEN OPENSUSE 12.1|
|OPENSUSE 12.1 ON WINDOWS VISTA|