as far as I know, you can not open .pst...
you need to import .pst into outlook using File --> Import/Export wizard to see the contents.
WHAT???? I thought u were an IT Professional.
You need to have Outlook installed, and open. Then just go "File/ Open/ Outlook Data file" and just point to the proper .pst file and ur all set.
PS: Don't listen to mods around here!