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It converts an entire OST file, or items within an OST file, into a PST without changing the original content format or structuring. Read More Read More


Stellar OST to PST converter has worked wonders for Outlook 2003 to 2016 conversions of OST Files. This application I use and resort to. Read More


Key features


Effective OST to PST export solution

Stellar Converter for OST readily exports the mailbox data from inaccessible OST file to PST file. How? It extracts the data from inaccessible OST file in a PST which can be exported to Outlook application installed on any system.

As compared to the Outlook Import Export wizard, Stellar Converter for OST provides a quick and simple solution to export mailbox data from OSTs to PSTs with the help of a rich GUI. The Import Export utility requires technical proficiency and time, and needs the OST-associated mailbox profile to extract OST data in PST.


Export the complete OST file data to PST

It can export the complete mailbox including emails, attachments, contacts, calendars, tasks, etc. from the inaccessible OST file to PST file. Alternatively, you can use the Search and Save functionality to choose specific emails or mailbox items to export from the OST file to PST.

You also get an enhanced preview of emails, calendars, and deleted items before actually converting the OST and exporting the data to PST. The trial version of the software offers to export up to 20 emails per folder from the OST file to PST. Apart from PST, the software also extracts the OST file data in MSG, EML, RTF, HTML, and PDF formats.


Export mailbox data from encrypted OST files

You may have encrypted the OST file to safeguard data, but what happens in case when you lost the password or decryption key? In this situation, Stellar Converter for OST provides a powerful solution to extract mailbox data from the encrypted OST file and export it to PST.

The OST PST export software retrieves data from inaccessible, encrypted and large OST files. It is widely compatible with Office 2019, 2016, 2013 (32 bit and 64 bit versions), Office 2010 (32 bit and 64 bit versions) / 2007 / 2003 / 2002 (XP) / 2000.


Export OST data directly to Office 365

Stellar Converter for OST can help you make a smooth transition to cloud. How? If you're planning to migrate your mailboxes from on-premises Exchange to Office 365, and have data inside inaccessible OST files, use this software to extract the mailbox data and export it directly to Office 365.

For exporting OST data to Outlook mail hosted on O365, you'd just need an Office 365 account with valid login credentials. The OST to PST export software connects with Office 365 interface to enable a seamless mailbox migration experience.

*Free Download to preview the converted PST file and save 20 items per folder.

Why do you need to export mailbox data from OST to PST?

When your OST file is unable to synchronize with Exchange Server due to reasons like server crash or an unbootable local machine that stores the OST-associated mailbox profile, the data inside the OST file becomes inaccessible. You will not be able to access the OST data unless you've the associated Exchange account profile. Similarly, when migrating to another email service or cloud such as Office 365, you will not be able to extract data from such orphaned OST files unless you've the associated mailbox profile. Stellar Converter for OST export inaccessible and encrypted OST file to PST which can be opened in Outlook. It exports data for OST files in Office 2019, 2016, 2013, and earlier versions.

Software Specifications

Operating System

Windows 10, 8.1, 8, 7, Vista, XP


Pentium Class


512 MB Minimum

Hard Disk

50 MB of Free Space

Single User License

Can use only on a single system

Technician License

Can be used on '3' Systems Simultaneously



Software Delivery



There are free tools and methods to export mailbox data from OST to PST, but these have limitations. For example, the Outlook built-in Import/Export utility needs the associated Exchange account for exporting OST to PST, so, it will not work in case of inaccessible or orphaned OST files. Also, the utility cannot export an OST file in case it is inaccessible or encrypted. Another factor is that manual and free tools require technical proficiency to run them correctly, with less reliability and high risks of human error as compared to specialized OST to PST export software that are built for the task.

The process to export IMAP OST file to PST is simple.

Login to Outlook with the associated Exchange account, and then follow these steps:

  1. Go to Files >Open & Export and click Import & Export
  2. Select 'Export to a file' from the available options. Click Next
  3. Select Outlook Data File (.pst) in the next screen
  4. Select the top-level folder of your mailbox (displayed as your email address)
  5. Select the checkbox to Include Subfolders and click Next
  6. Browse the location to save the new .pst file.
  7. Select the 'Do not export duplicate items' radio button
  8. Click Finish to export the IMAP OST file to PST
  1. Download and install Stellar OST to PST Converter software
  2. Run the software and click the Browse button to upload the OST file that needs to be exported
    1. In case you don't know the exact location of the OST file, click Find button
  3. Once the OST file is uploaded, click the Convert button to begin the scanning process
  4. In the dialog box, select PST option in the Save As section.
  5. In the Destination Path section, click Browse to specify the location for saving the PST file.
  6. Click Ok to save the OST to PST exported file

There is no built-in or custom script for exporting an OST to PST. You can export an IMAP OST to PST by using the Outlook Export/Export utility. In case if the OST is a standalone orphaned file, use Stellar OST to PST converter for exporting the mailbox data.

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