After performing the PDF archiving please close outlook select the Control Panel from the Start Menu. In the control panel select the Mail option. (If you do not see the Mail icon please select the link that says Switch to Classic View)
In the Mail Setup dialog box please select the Data Files option, this will load the Account Settings dialog box and should already have the Data Files tab selected.
If you have any files listed other than your SHSU Mailbox, then please select them and delete them using the Remove button.
Now that you have successfully disconnected the pst files from your Outlook account you can begin removing the pst files themselves from the S drive.
Select the Search tool in the Start Menu.
In the Search for files and folders box please type in .pst (the second time around please search for .ost files). For the Look In drop down please select the option that shows your Username on 'WinFSHD...(S:)
After the search has been run you will get the list of pst on the right.
You can now Right click on the individual files and delete them (NOTE if a pst has not been disconnected from Outlook, Windows will not allow you to delete the pst file).