ubuntumouse

On the MCS VMWare server distribution of Ubuntu, use the following steps to get your scroll wheel to work:
 * Press CTRL+ALT+F1 to access the shell (you may also use the terminal)
 * Once logged in, execute the command "sudo nano /etc/X11/xorg.conf"
 * Scroll to the section "Section 'InputDevice'" that contains the item "Identifier 'Configured Mouse'".
 * Delete the line that contains the option "Emulate3Buttons"
 * Change the "Protocol" option from "ps/2" to "ImPS/2".
 * Exit and save the file.
 * Go back to the GUI with CTRL+ALT+F7.
 * Restart the xserver with CTRL+ALT+BKSP.

Your scroll wheel should now work! :D