RE: WLM 8.5 and 2009
Once 8.5 is installed, go to the directory (C:\Program Files\Windows Live\Messenger) and change the name of the Messenger folder to Messenger 8.5 (or something)
and then install WLM 2009 and it should install it in the default directory, leaving Messenger 8.5 still accessibly from its re-named folder
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