"Chuck" wrote in message
...

But that doesn't answer my first question and the
subject query: "Can my new Outlook 2007 use the old Outlook 2003 .pst (when
the old machine isn't looking, of course)?

Outlook 2007 and 2003 utilize the same PST format, so just open the PST with
FileOpenOutlook Data File.
--
Brian Tillman [MVP-Outlook]