Question: I recently upgraded to windows 7. I realized that the mouse scroll wheel no longer works in the remote desktop. The remote machine has been the same, so I bet the problem is on the client side. 

I am using microsoft (ironic) wireless mouse 5000 and microsoft wireless keyboard 3000. 

Anybody had this problem before?

Answer: 
If you are using the wonderful windows program KatMouse (it allows you to scroll whichever window you are hovering over), disable it.

I'm using windows 8.1 and scroll did not work in remote desktop because I had KatMouse enabled.
I was also finally able to get this working using AutoHotKey and this script

```
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 
#MaxHotkeysPerInterval 200 

; Installing the mousewheel handler only for the programs presenting this issue. 
; Remote Desktop
GroupAdd, MousewheelHandler, ahk_class TscShellContainerClass 

#IfWinActive ahk_group MousewheelHandler 
WheelDown::WheelDown 
WheelUp::WheelUp 
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 

```