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Definition

PST file

A PST file is a personal folder file in Microsoft Outlook. In Outlook, the storage limit for a single user's .PST file is 2 GB. PST stands for personal storage.

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Getting started with PST files
To explore how PST files are used in the enterprise, here are some additional resources:
Microsoft Outlook .PST file FAQs Troubleshoot Outlook .PST file issues with this collection of FAQs, from importing and exporting data to file repair and recovery.
Why are .PST files a security threat to Exchange Server mailboxes? The use of .PST files can threaten mailbox security in an Exchange Server organization. Learn why these files are so problematic and how to disable them.
Create a group policy to prevent .PST file storage in Exchange 2007 Use the Group Policy Object Editor in Active Directory to prevent users from storing new data in .PST files on Exchange 2007 and Microsoft Outlook 2007.
Migrating .PST files to an Exchange Server information store The first step to migrate .PST files to an Exchange Server information store is to get Microsoft Outlook users to save .PST data to their Outlook mailboxes.
Lock down Microsoft Outlook 2007 to prevent .PST file access The final step to eliminating the use of .PST files for mailbox data storage in Exchange Server 2007 is locking down Microsoft Outlook 2007.
Migrating older .PST files to Microsoft Outlook 2003 Find out how to take advantage of Microsoft Outlook 2003's 20 GB .PST file size limit.
Control Microsoft Outlook .PST file size and usage via the registry Learn how to control and prevent Microsoft Outlook .PST problems by implementing registry keys that manage ANSI- and Unicode-based .PST file size and usage.
This was last updated in December 2008

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The file format may also be known as a Personal Folder File. PST File used to store copies of messages, calendar events, and other items. http://freeoutlookpstrepair.weebly.com
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PST size limit depends on file format. Pre versions of Outlook 2003 are using ANSI format. This file format is limited to 2 GB.
Outlook 2003 and its post versions are using Unicode file format. This kind of format has larger space which is up-to 50 GB in Outlook 2010 & Outlook 2013.
To know other facts related to PST file, reach at:
http://outlook-troubleshooting-tips.blogspot.in/2013/09/a-predefined-strategy-to-secure-outlook.html
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I've never heard of these files...
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To make everything easier I often use this tool: <a href=http://www.coolutils.com/OSTtoPSTConverter>http://www.coolutils.com/OSTtoPSTConverter</a> working with PST. It really helps.
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If you have any problems with size of .pst files
you can try this free tool:
http://www.pst-file-splitter.com/
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