>I assume you can use the RUN command to run outlook - but how do you find it's location on the particular machine - or is there another way to specify it?
>

Try looking in the registry; if it's installed, there will be a registry key for the ProgID Outlook.Application under HKEY_CLASSES_ROOT\Outlook.Application; this will point at a CLSID; locate the registry key HKEY_CLASSES_ROOT\CLSID\the CLSID you found under the ProgID; it will have a LocalServer32 subkey; the default value is the actual full path to start Outlook.

You could also check for the presense of the registry key HKEY_CLASSES_ROOT\outlook\shell\open\command - the default value will be the executable path, with the addition of a parameter used when Outlook is started through OLE - if you double-click in Windows Explorer on a saved email for example - strip the "%1" at the end of the registry value to remove it.