Try this:
Code:

Start > Run:
RunDll32 advpack.dll,LaunchINFSection %windir%\inf\msmsgs.inf,BLC.Remove

In regedit (for OE):  HKEY_LOCAL_MACHINE\Software\Microsoft\Outlook Express

New Dword value > name = "Hide Messenger" value = 2



Not sure if that works for Outlook as well, but it's worth a shot. The first thing will definitely get rid of Messenger though.
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