Computers and Technology

How to Open OST File without Outlook – Expert Recommended Guide

How to Open OST File Without Outlook-How to Fix this Error?

Outlook data file OST is used to store the user profile data and this file format (.OST) is only supported with MS Outlook. For a person which has no outlook installed on their computer, it is difficult to read the OST file data. So, here in this write up we are going to discuss the method by which users get the solution for How to open Outlook data files (.ost) without Outlook requirement.

Learn how to open OST files without Outlook when you don’t have access to your Outlook profile or are experience Outlook data file (OST) related issues while accessing your Outlook account, this tutorial will assist you to convert and accessing an orphaned or huge OST file. It will also assist you in recovering lost or deleted mailbox items from inaccessible OST files, including emails, attachments, contacts, calendars, notes, journals, and so on.

The user profile data is stored in an Outlook data file called OST, and this type (.ost) is only supported by Microsoft Outlook. It’s a tough to view data if you don’t have Outlook installed on your PC. So, in this article, we’ll go through how to open OST file without Outlook installed.

When a user configures his account using exchange settings, Outlook creates an OST file. Outlook saves a copy of all Exchange Mailbox data, including emails, contacts, tasks, notes, and other items. When the internet connection is slow or there is another problem, users can operate in offline mode with OST files. However, it has a flaw as a result of these traits. MS Outlook is the only program that can open an OST file.

Why Can’t I Open an OST File Without Outlook?

Outlook offline folder (.ost) file is created when a user connects to an exchange server with cached exchange mode enabled. So, if your Outlook profile is configured with an exchange mailbox, you can only access the OST files. The OST files can become unavailable due to a synchronization issue between the exchange server and your Outlook email client.

OST files become inaccessible for two reasons:

Hardware Issues

  • Storage media failure: You cannot access the database and OST file if the storage media storing your exchange server database crashes or has any bad sectors.
  • Power failure or server down: When there are unexpected power outages or a sudden shutdown of the exchange server while accessing the database, your database may be harmed. This may take the OST file inaccessible.
  •  Failure of controller card: If something goes wrong with the catching problem, the cached data and database may be lost. His results are in an orphaned OST file.

Software Issues

  • Accidental Deletion: If the mailbox on the exchange server where the OST file was created is accidentally deleted, the OST file will become inaccessible.
  • Virus or Malware attack: The exchange server database can be harmed by viruses and malware. The OST file will not be accessible.

Why is it Necessary to Open OST files Without Outlook?

  • When a user has an orphan OST file on his or her PC and wants to open the data contained in that OST file.
  • When a client or colleagues send you an OST file, be sure you have Outlook installed and configured with the exchange server.

Manual Method to Resolve the Problem

  1. When you convert an inaccessible OST file to a PST file, you can read emails and other stuff from it.
  2. There is no way to access the OST file manually because there isn’t one. Here’s another option for resolving the problem.

Automated Way to Open OST File Without Outlook

SysTools OST Converter is a multi-purpose application that leads lets you open OST files in offline mode. Without using Outlook or Exchange, you may simply explore OST file data, such as emails, contacts, calendars, and other objects. In Windows 10,8,7 (32 bit or 64 bit) and Windows server 2016, 2012, R2, 2008, this utility allows users to easily access OST files, even password-protected, corrupted encrypted files.

Note: If your OST file has become severely corrupted and is no longer accessible. Before you can restore the file into Outlook, you must first recover it. To restore a corrupted OST file without any limits or data loss, use this proficient third-party software.

Step By Step Instruction to Resolve the Problems

  • On your computer, download, install and run the software.
  • Now, select Add File from the File menu.
  •   You can also choose between Quick scan Mode and Advanced Scan Mode and then click the Add file button.
  • The utility will then import all of the OST data files into software’s interface.
  •  To open OST files without Outlook in detail, the user can use several previews modes such as Properties View, Message Header, View, MIME View, and so on.
  • The software also allows the user to print or export OST files to PDF.  


When a user is required to access an orphan Outlook OST file, the operation becomes extremely difficult for him or her. As a result, in the preceding part, we have presented a reliable and intelligent method for opening OST files without Outlook. The user may open, and analyze an OST file without having to utilize an email client. The software is built with advanced data protection and security algorithms, ensuring that there is no risk of data loss or security breach while using it. Learning how to open an OST file without Outlook is no longer problem.   

Also Read: How you can Fix QuickBooks Error 80070057 and Microsoft SharePoint Consulting

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