Okay Ralph here is a little more information.
This has only been tested on 1 Windows XP and 1 Server 2003 system and does appear to work. Your mileage may vary.

Download MSN Messenger
http://messenger.msn.com/Download/

Using Winzip or WinRAR you can extract the file MsnMsgs.msi from the SetupDl.exe file of Messenger 6.x



Quote:

Monitoring the registry during install of MSN Messenger 6.2 returned the following

Keys added:299
Values added:406
Values modified:10




And here is some KiXtart code to accomplish either Installing or Removing MSN Messenger 6.x (default installations only)

Code:
Break On

Dim $SO

$SO=SetOption('Explicit','On')

$SO=SetOption('NoVarsInStrings','On')

  

Dim $MSN

$MSN=MSNMessenger('I')

 

Function MSNMessenger($Method)

Dim $Key,$Operation

Select

  Case $Method = 'I'

    Shell 'msiexec /i ' + @CurDir +'\MsnMsgs.msi IAGREE="Yes" ADDEXPLORERTOOLBAR="" SETSEARCHENGINE="" SETHOMEPAGE="" /q'

  Case $Method = 'U'

    $Key='HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{ABEB838C-A1A7-4C5D-B7E1-8B4314600137}'

    $Operation=Join(Split(ReadValue($Key,'UninstallString'),'/i'),'/q /x')

    Shell $Operation

  Case 1

    $Operation = MessageBox("Invalid input, please use either an I to install or a U to uninstall", "MSN Messenger Error", 4112)

EndFunction