What is PST File Extension?


PST stands for Personal Storage Table. The file format is capable of storing all information of MS Outlook including attachments, emails, contacts, notes, messages, events etc. It is constructed using a Binary data file algorithm. There are two popular versions of PST- ANSI, and Unicode. The Unicode is the upgraded version.


It comes under the category of a Database file.

Supportive Apps

It supports only MS Outlook for Windows.


It is the tech giant Microsoft that has developed PST and other file formats related to MS Outlook. The company has tried every possible way to make MS Outlook advanced and sophisticated.

MIME Types



hexadecimal: 21 42 44 4e

Types of PST

The ANSI version is a previous version which supports MS Outlook 97-2003 which can able to hold up to 2GB database.

The latest Unicode version stores data of MS Outlook versions 2003-2016 which allows you to save up to  50GB database.


The location of PST is based on the MS Outlook version.

MS Outlook 2016

Outlook 2016: HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\

MS Outlook 2013

Outlook 2013: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\

MS Outlook 2010

Outlook 2010: HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\

How to open or view PST File Extension

Manually, users can access PST form in MS Outlook account. For this, they will first go to the import/export option and then import.

There are some free and paid PST viewer which shows the data of PST.

Prominent conversion from PST

Prominent conversion to PST