(imported comment written by cstoneba)
what I would do is just look up what the actual folder is by searching the registry. The issue here is that this location changes per Outlook version (http://www.groovypost.com/howto/microsoft/outlook/find-the-microsoft-outlook-temporary-olk-folder/)
You could do something like this, but again, you would need to get the logged on users hive instead of the current user, because current user is SYSTEM (because that is what BigFix runs under) and not the actual logged on user.
value “OutlookSecureTempFolder” of key “HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security” of registry