Well, solved the problem... sort of.
Removed all the pst files and uninstalled office, then reinstalled office again and did the import of the pst file and pointed the mailbox directory to a different location than the default. Now I have only one pst file on the machine and regained 9GB of disk space.
Now to figure out why Photo Editor launches as Photo Viewer on the 32 bit machine. It works just fine on the 64 bit machine.