Information about the .pst (pst) file type

This is one of two possibilities that we have on file for the .pst file extension, follow this link to view both possibilities.

Below is all the information we have available on file about the .pst (pst) file type.

Personal Folder File for Microsoft Outlook. The extension .pst is possibly derived from "Personal STore".

Where emails are not stored on an Exchange server they are stored in a local .pst file. Even when an exchange file is used .pst files can still be created and used without outlook and provide a convenient way to store emails, calendar items, notes etc locally outside of Exchange.

Microsoft Outlook limits the size of .pst files to 2GB, and should the size go over this then the file becomes unusable by Outlook. Outlook XP or Outlook 2000 with service release 1a protect against going over this 2GB limit, earlier versions do not.

The following links provide further information related to the .pst file extension:

Where this is available we would like to include file format information on .pst files, as well as information on how to view or open files of type .pst. If you know of any information which we have missed then please let us know.