Definition of 'OST file'

An Offline Storage Table or OST is an Outlook data file, also known as an Offline Folder, which stores a local synchronized copy of an Exchange mailbox. The OST file is created when a user adds an Office365, Exchange, or IMAP account to their Outlook mail client.

The Offline Folder allows users to access their Outlook account and mailbox items when offline or experiencing connectivity issues. All changes made to items such as Emails, Calendars and Contacts whilst offline are stored in the OST file. As soon as the system connects to the internet, Outlook synchronizes the changes to the mailbox on the server using the OST file.

OST file - Offline Outlook Data File

Compatibility	OST files are used in Microsoft Office365, Exchange, and Outlook versions 2013, 2016 and 2019.
OST file size limitations	There is no size limitation, however the technical limit lies at 4096 TB.
Service Provider	Microsoft Corporation

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How does OST PST Viewer use OST Files?

OST PST Viewer is the perfect tool to open and extract information from any PST file. Access and backup important Outlook data from PST files even without Outlook installed. Open corrupted or orphaned PST files.

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OST PST Viewer Customer Reviews

Average Rating: 4.8/5 - 295 reviews

“ I downloaded the free version and it does exactly what I needed it to do. Installation was fast and easy and I managed to restore 5 months of emails that were previously lost. I cannot thank you enough and I heartily recommend this Product. ”

mark v.

About OST PST Viewer

OST PST Viewer is a free* software designed to view PST and OST files in a few clicks. Open PST and OST orphaned Outlook data files. Search and export Contacts, Calendar, and Email folders content to PST and other file formats.

*Limited features with OST PST Viewer Free version. Advanced search, exporting, copying text, saving attachments and printing items is only available with the Pro Version of OST PST Viewer.

Frequently Asked Questions

Can I open and extract PST files without Outlook installed?

Yes. As OST PST Viewer is an independent OST reader, it can operate without Microsoft Outlook installed.

Can I export emails or view attachments using OST PST Viewer?

Yes, you can. OST PST Viewer supports many popular file formats: GIF, TIF, BMP, JPG, VCF, ICS, MSG, and MHT. Export Emails, Contacts or Appointments as well as Email attachments.

Will OST PST Viewer help me view corrupt or damaged OST files?

Yes, OST PST Viewer provides the perfect solution to open OST files even if they are corrupted, damaged, or inaccessible.

Does OST PST Viewer support different Outlook version files?

Yes, the software works with all PST files starting from Outlook 2002 and all OST files, including IMAP and Exchange types.

How do you read OST files using OST PST Viewer?

Just follow these simple steps:

Download, install and launch OST PST Viewer on your PC;
To add a file to OST PST Viewer, go to the "File" tab and click "Open";
Choose the PST or OST file you would like to open;
You can now easily explore your PST or OST file content without Outlook.

About 4Team Corporation,

the company behind OST PST Viewer

We are a Microsoft Gold Certified Partner and independent software developer and vendor. Since 1999, we have provided business solutions to our corporate customers and individual end-users worldwide. We are very proud to be highly recommended by our satisfied customers and offer award-winning support.

Our satisfied customers

Customers all over the world are successfully using 4Team Corporation services for personal and business needs