Hi, nnigam

There are only a couple of ways of doing this (opening the pst).

1. As part of Outlook or MAPI where a pst file is represented as a Message Store
2. As an individual file

I don't know how to do (2) but I know a project that does. Have a look at LibPST at either http://sourceforge.net/projects/ol2mbox or http://freshmeat.net/projects/libpst/. If you can convert the pst to mbox format you can then use one of the standard mail modules to do what you want.

HTH --
Mark