To find Outlook PST files:
* Locate your Personal Folders in Outlook and then Right-Click it.
* Choose Properties
* Click the Advanced... Button
* The Filename field will tell you where your PST file is for your personal folders.
It will be something like:
C:\Documents and Settings\YourLoginID\Local Settings\Application Data\Microsoft\Outlook\Outlook.pst
Browse to the folder, in the above example:
My Computer --> C: Drive --> YourLoginID --> Local Settings --> Application Data --> Outlook
In this folder you should see your PST file(s).