vitrualbox - mouse intergration

1.) Verify that your /usr/lib/xorg/modules/input/ on the guest contains in fact a vboxmouse_drv.so file.
Code:
oot@oraub32:~# ls -la /usr/lib/xorg/modules/input/vbox*
-rw-r--r-- 1 root root 186664 2008-10-25 19:30 /usr/lib/xorg/modules/input/vboxmouse_drv.so 

2.) sudo gedit /etc/X11/xorg.conf

3.) paste those lines into your xorg.conf
Code:
Section "InputDevice"
   Identifier   "Configured Mouse"
   Driver       "vboxmouse"
   Option       "CorePointer"
EndSection 

4.) restart your X-Sesson of the guest.