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2 Methods to Convert OST to PST Format for Free Without Outlook

Nilesh Kumar | Modified: August 23, 2022 | Email Tips | 6 Minutes Reading

In this blog, we are going to discuss effective 2 methods to convert OST to PST. Simply read the complete write-up and perform the steps. You can use exported PST in any version of Microsoft Outlook. The expert suggested way to save OST files to PST, use the utility:

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MS Outlook is an email client, widely used by business organizations, and offices for their communication purpose. Most users configure their account with MS-Exchange Server which works in synchronization and saves data in Offline Storage Table (.ost) file format. OST file contains data in offline mode on a hard drive.

When a user logs in with the IMAP account, every time data is synchronized and downloaded to the system in the OST file format. It helps to keep data up-to-date in the mailbox with new emails, reports, meeting requests, etc.

Sometimes when the User creates an account with IMAP configuration, then it also works as a web server-based application and stores synchronizing data in (.ost) format.

However, there are various situations when these files become inaccessible. To manage the situation, the user needs to change the OST file into another file format i.e. PST. So that data can easily be accessed in offline mode. In the below section, I am explaining 2 methods to Convert OST to PST format.

Reasons Why to Convert OST into PST?

There may be different situations when the user needs to convert an Exchange IMAP .ost to .pst, Some reasons are discussed below:

1. Sometimes, MS Exchange server crashes unexpectedly due to various reasons like-

  • Power Failure
  • Malicious Software
  • Virus Attacks, etc.

Such types of situation are difficult to handle when data become inaccessible and the screen displays error messages repeatedly.

2. In some cases, due to Exchange Server maintenance and downtime, data become very challenging to access mailbox data. Data is saved in the mailbox with the .ost extension which synchronizes with the server, it becomes inaccessible. To access the data user needs to export their emails from OST to PST file format.

3. When users export mailboxes from OST to PST, corrupted or accidentally deleted data can also be recovered.

4. Conversion of OST to PST is also helpful in data migration. In situations when the user wants to shift from one place to another place, it is easy to migrate PST data from one place to another place.

5. Exchange profile is inactive and the OST file becomes an orphan. In this situation you have only one option left, convert orphaned OST file to PST format and access complete data.

Methods to Convert OST to PST

Now, We know that when we need to change the OST file to a PST file. However, in the next section, we will discuss different methods to export OST data to PST.

  1. Convert OST to PST Outlook Manually
  2. Expert Suggested Way to Convert OST Files to PST

Method-1: Free Convert OST to PST Manually

To convert OST to PST files manually, your system must be configured with Outlook and connected with the MS Exchange server. For the further procedure, the steps are as follows:

Step-1: First, you need to open MS Outlook then, click on “File” and select the option “Import/Export”.

import export

Step-2: A new dialogue box opens asking to “Choose an action to perform”. Select “Export to a File” and proceed.

choose action

Step-3: The next screen will ask to choose the file type to import. Choose “Outlook data file (.pst)” then hit the button to “Next”.

select file type

Step-4: Now, choose the folder to export data from, and click on “Next”.

export from

Step-5: Choose an option from the list “Allow duplicates to be created” and click “Finish”.

allow duplicates

Step-6: After it, a new pop-up com to ask for an optional password. You can easily move ahead without entering it.

Now, manually converted Microsoft OST data into PST file Outlook. You can check your OST files which have been saved in PST file format at the selected location.

Limitations of Manual Method:

We have discussed the above manual method to convert OST to PST without Outlook, having some drawbacks, as mentioned below:

  • Need to configure Outlook Account in the system.
  • The system must be connected to the MS Exchange Server.
  • The slow process as compared to manual methods.
  • Risk of data loss or corruption.
  • Need a technical expert to follow the procedure.

Method 2: – Convert OST to PST Using Software

To overcome the limitations, we are recommended to use an automated tool to convert OST to PST without Outlook.

OST to PST Extractor is one of the best third-party software which makes this task easy and facilitates a user. It completes the process of conversion in just a few simple steps and is free from risks or error chances.

This software export OST mailboxes to PST equivalent file format. It also allows us to recover, backup ad extract all items of offline OST files.

Also helps to convert IMAP .ost to .pst, with not having any file size limitations. It provides a preview of data like emails, contacts, calendars, or other mailbox items before conversion.

This tool also has the additional ability to save OST files into different file formats like PST, HTML, MSG, EML, MBOX, EMLX, NSF, PDF, vCard, CSV, ICS, TXT, MHT, DOCX, DOC, and RTF. It also provides a demo version for free with limitations to export only the first 25 items per folder. Then, if the user will be satisfied, they can go for a licensed version available at affordable prices.

When to Use Professional Software:

The Outlook Import/Export feature has some limitations. You can use OST to PST converter software to get around them.

  • Convert OST file without Outlook
  • Same Profile and IMAP Configuration Not Required
  • Convert Large Size OST File without Any Limitation
  • Convert Orphaned OST File to PST Format
  • Export Corrupted, Inaccessible, Offline OST file

Steps to Convert OST Files to PST without Outlook

Follow these simple steps to convert emails from OST to PST file format without Outlook, with the help of this tool:

Note: – The software is capable to export orphaned, corrupted, inaccessible OST files to PST format even without Exchange profile and server connectivity.

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Step1: Download OST to PST converter and install the software in your system to start the conversion process.

convert OST to PST

Step2: Simply Add Files and preview OST recovered files into the software.

preview OST file data

Step3: To export click on the radio button to PST and proceed.

select PST

Step4: Browse the destination location to save exported PST in your system.

convert OST files to PST

Now, the procedure has been completed to convert from OST to PST in just a few steps. You can check your converted PST data at the destination location. Get the complete guide for OST to Outlook import process.


Manual methods free process and help to complete conversion but have some limitations. You can convert OST to PST manually free if your system is having MS Outlook configured with Exchange Server. These methods usually take longer procedures.

Using third-party software is a more facilitated and 2 effective method to convert your OST file emails to PST. We recommend using this software because it is user-friendly and advanced functionalities. Use this trusty and efficient software to deal with your vital data.