Exchange ⁄ Outlook OST File Overview

Offline Storage Table (.OST) files are created by Outlook /Exchange Server that keeps offline record of Exchange Server emails stored in the client machine which are inaccessible when orphan or corrupted.

(At the moment of downtime Exchange Server, OST file is a useful resource for email client. On the cache mode, Outlook user can recover deleted or lost emails, images, files, email properties (like To, From, CC, BCC, Subject, Date and Time) from them.)


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  • It plays important role to get back emails on cache mode.
  • Outlook users can retrieve deleted emails via them
  • On Cache Mode, it is an exclusive resource, Outlook email client can restore deleted or lost emails from them.
  • The Outlook.ost file allows you to work offline without Exchange Server connection and offline Outlook data file synchronized with the Exchange Server when network is available.

Download to Fix Corrupted OST file

Know Advantageous Info about OST File and PST File

Microsoft Outlook is an email application and works as your personal assistant to manage important information in email, calendar, contacts and tasks for further uses. Outlook offers you to create several accounts using POP3 and IMAP and widely used email application over various email clients. Outlook emails are save in PST format which can be easily read in mailbox, it also save in OST file format which is exist in client machine and does not open by default in Outlook mailbox. On Cache Exchange Server Mode, you can open Offline Storage Table (.ost) file in Outlook as Personal Storage Table (.pst) file.

Outlook email items are saves on mail server as well as on your computer in format like OST file and PST file. Outlook OST file is copy of synchronized emails and save on local machine in an offline Outlook data file (.ost) created during synchronization process between Exchange mail server and Outlook application. Both OST files and PST files is part of MS Outlook, as you know that PST File is Personal Storage Data Table which store all personal E-mail and their attributes but OST files is created by MS Exchange Server that's keeps E-mail record on off-line mode in client machine. When Outlook user does work on off-line or server downtime, OST file play vital role to help in recovery of E-mail with OST File Repair tool.


More About Outlook OST File Manager Tool

You read more about individual freeware product:

OST File Viewer

It is a marvelous tool to quickly scan unreadable OST file and view including Emails, Contacts, Calendars, Tasks, and Journals.

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OST File Locator

Tool to search out OST file with their properties and including details from multiple locations existing in the client machine.

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OST File Finder

Tool to search in all system drives and find out offline storage table (.ost) file as well as exports searched list of OST file into CSV file.

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Read About All OST File Freeware Tool


You Can Also Read About Useful OST Converter

OST to PST Converter

Magnificently convert unreadable offline Outlook OST file into readable PST file including entire email properties.

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OST to PDF Converter

Successfully save multiple emails of Outlook OST file into PDF file format including emails, contacts, journal, task etc.

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Batch OST to PST

Quickly convert multiple unworkable or corrupted OST file into usable PST file. User can also save it into EML or MSG file.

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Read About All OST File Converter Tool