Hi I use Mint 6, and from virtual box.org got the Ubuntu version, for 32 bit. This is for my lap top, the first download was a success in my desktop.
My first download missed a file, so I got the version before, maybe Ubuntu Jaunty. It worked, and as I installed Microsoft Office I maybe pressed it a few times and got a warning and several boxes appeared. After this, no cursor switch was possible, even after a restart of the virtual machine and the whole machine.
Neither by right CTRL or clicking in the windows space and clicking yes to switch.
Also the windows does not maximize much, just gets a think black border.
Running WIndows XP.