Ubuntu X11 xorg config for marble mouse logitech

50-marblemouse.conf

## SOURCE: https://help.ubuntu.com/community/Logitech_Marblemouse_USB#Example_Configuration_.231:_add_wheel_emulation_feature
## SOURCE: https://wiki.archlinux.org/index.php/Logitech_Marble_Mouse#Sample_configuration
Section "InputClass"
        Identifier  "Marble Mouse"
        MatchProduct "Logitech USB Trackball"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "evdev"

#       Physical button #s:     A b D - - - - B C    
#       Option "ButtonMapping" "1 8 3 4 5 6 7 2 2"   right-hand placement
#       Option "ButtonMapping" "3 8 1 4 5 6 7 2 2"   left-hand placement
#       b = A & D 
#       Option "ButtonMapping" "1 8 3 4 5 6 7 2 2"  

#       EmulateWheel: Use Marble Mouse trackball as mouse wheel 
#       Factory Default: 8; Use 9 for right side small button
        Option "EmulateWheel" "true"
        Option "EmulateWheelButton" "3"

#       EmulateWheelInertia: How far (in pixels) the pointer must move to
#       generate button press/release events in wheel emulation mode.
#       Factory Default: 50
        Option "EmulateWheelInertia" "10"

#       Axis Mapping: Enable vertical [ZAxis] and horizontal [XAxis] scrolling
        Option "ZAxisMapping" "4 5"
        Option "XAxisMapping" "6 7"

#       Emulate3Buttons: Required to interpret simultaneous press of two large
#       buttons, A & D, as a seperate command, b.
#       Factory Default: true
        Option "Emulate3Buttons" "true"
EndSection

Put this file in /usr/share/X11/xorg.conf.d/

Does anybody know a reason why this would not work when running in VirtualBox?