What is PST? What Opens a PST? File Format List from WhatIs.com

File Extension

PST File Format

Personal Folder File (Microsoft Outlook)

Troubleshoot .pst files at ITKnowledgeExchange.com

A .pst file is a personal folder file in Microsoft Outlook.  PST files hold all data located in Outlook when Exchange Server isn't being accessed. PST stands for personal storage. Primarily used for local email data storage, Outlook .PST files can pose compliance and email archiving issues for Exchange organizations. By default, .pst files are in the Unicode format in Outlook 2007 and in Outlook 2003 and the limit default is 20 GB.Scanpst.exe can be used to recover folders and items from a corrupted .pst file in Microsoft Outlook 2002, Outlook 2003, and Outlook 2007. Scanpst.exe is a hidden file that is installed automatically when Windows is installed. Scanpst.exe is also called the Inbox Repair Tool.

Learn more:

SearchExchange.com has tips and tutorials to help you  troubleshoot .PST file issues

Learn how to configure the size limit for .pst files in Outlook 2010, Outlook 2007 and in Outlook 2003.

Microsoft provides directions for using the Inbox Repair Tool

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This was last updated in May 2010
Editorial Director Margaret Rouse

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