In this article, learn how to convert OST into PST file using dedicated software. It will help you to convert inaccessible/encrypted/orphaned OST files.

In our previous guides, we seen how to fix damaged PST file and also, how to repair and recover data from large PST files. Now, in this guide, we’ll see how to convert the OST file into PST file.

If you’re not aware about an OST file and wonder why it is used, here is the answer. Well, an offline Outlook data file is saved in .ost file format. It is used for other account types, such as IMAP accounts, Office 365 accounts, Exchange accounts, and accounts. An OST file usually keeps a last synchronized copy of your data so in case if you lost Internet, you can still access your data. Upon restore of Internet connection, all content are re-synchronized so you stay up-to-date.

Sometimes, IT administrators may face common issues such as synchronization failure or crash of Exchange Server and this may make the OST file inaccessible. Or if you’ve a situation when you migrate to new email server/service, or client to a new machine, the OST file and mailbox may lost. In such cases, you need to deploy a smart solution such as Stellar Converter for OST. Here is how you can overcome these kind of situations and recover data from inaccessible OST file and convert it to PST with exact replica of mailbox.

How To Convert OST Into PST File

1. Download the OST to PST converter software from Stellar‘s website. Install it and then launch the tool. Click on Select Outlook OST button.

How To Convert OST Into PST File

2. Next, if you’ve OST file inaccessible, click on Find. In case if you know the location for OST file, you can use Browse button to provide its location. Once you locate OST file, click on Convert.

How To Convert OST Into PST File

3. The file will be then analyzed which may take few moments.

How To Convert OST Into PST File

4. Then you’ll see file conversion and track its progress. Note that you can easily convert larger OST file to PST file using this software.

How To Convert OST Into PST File

5. Once the file is converted, you’ll progress on conversion of mailboxes.

How To Convert OST Into PST File

6. Once conversion of OST file is completed, you’ll be notified.

How To Convert OST Into PST File

7. Then, if you like, you can save converted PST file.

How To Convert OST Into PST File

Additionally, you can use Find Message button to look for a mail or specific information. This will also help you to confirm that all your data has been restored.

How To Convert OST Into PST File

You can anytime use the Save Scan button in the software to safeguard your scan information. Later, you can just hit Load Scan and software instantaneously load your information, saving your time for re-scan.

How To Convert OST Into PST File

‘Stellar Converter For OST’ Features

  • It can find orphaned and inaccessible OST files and convert them to PST files.
  • Ability to convert multiple OST files to PST files.
  • Supports OST files of Outlook 2019, 2016, 2013, 2010 and older versions.
  • Can extract mailbox folders and create exact replica of them.
  • Can extract Exchange Objects from OST with greater precision
  • Supports conversion of OST to variety of formats including MSG, EML, RTF, HTML, and PDF.
  • Extracted mailboxes are organized in the view they’re in.
  • Encrypted OST file can be converted to PST file.
  • It can split and compress large PST files (Technician edition).

Stellar Converter for OST comes in Corporate, Technician, Toolkit editions. You can use the link mentioned in step 1 to compare editions and buy this software from Stellar’s website.

Hope you find the article useful!

FYI: This article mentions third-party software, which is shared here for convenience of readers. It is always advisable to create a System Restore point first, before using these tools.


  • I tried to convert my OST file to the PST file using the manual method but in the end, I found the file was orphaned and could not be converted using the manual method. Then I went through the OST to PST converter which you have explained. Before your tool, I searched a lot about free OST to PST converters and tested OST files on that one by one. After performing so many testing’s on this OST to PST converter I found Stellar Converter for OST is very helpful as compared to others.

  • Kapil Arya

    ^^ Glad it helped you, thanks a lot for sharing your opinion!

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