PST files are Microsoft Outlook mail storage files. Open Outlook, then choose File > Open > Outlook Data File and click on the PST file, then click "OK".
These files were probably created by Microsoft Outlook in order to store email or calendar information directly on your computer. You should use Outlook or Outlook Express.
You can open. pst files through Microsoft Outlook. If you go to file, open, outlook data file then browse to the location of the. pst file and double click it.