Home : File Types : PST File

.PST File Extension

FREE DOWNLOAD Open any file with File Viewer Lite.

File TypeOutlook Personal Information Store File

2.8 (22 Votes) Thanks for voting!
Rare Uncommon Average Common Very Common
CategoryData Files


This file is saved in a binary format, which requires a specific program to read its contents.


Data storage file that contains personal information used by Microsoft Outlook and Exchange; includes e-mail folders, contacts, addresses, and other data.

More Information

PST files have a 2 GB limit and will cause Outlook to slow down when the file is close to the limit. Microsoft provides a program called the Exchange 2000 Tool: PST2GB that will reduce the file size of a PST file. However, the utility may truncate the file meaning some data will be lost, so you should make sure to back up the PST file first.

Unlike the full version of Outlook, Outlook Express does not use PST files. However, Outlook Express can import PST data using the program's Import feature. Mac users can use the PST Import Tool for Entourage to import PST data into Entourage or the PST to MBOX Converter to convert PST files to .MBOX files.

Programs that open PST files
Microsoft Windows LogoWindows
Microsoft Outlook 2016
Microsoft Exchange Server
Microsoft Outlook Express
Remo Repair Outlook (PST)
BitDaddys Email Open View Pro
Encryptomatic PSTViewer Pro
OEMailRecovery.com Outlook Recovery Toolbox
Mac OS X LogoMac
Microsoft PST Import Tool for Entourage
Stellar PST to MBOX Converter for Mac
Updated 8/6/2015