Two Free Proven Ways to Convert OST to PST File

Written By: Justin  Email Management & MigrationOutlook Error June 3rd, 2021

Are you looking for methods to convert OST to PST files? If yes, then this article proves to be the best guide for you. Here, you will learn about different techniques to convert the file format. Besides, you will also know the situations in which the OST to PST migration is ideal.

Both OST (Offline Storage Table) and PST (Personal Storage Table) are the Outlook data files. The main difference between these two file formats is that the OST files are for offline use while the PST files contain the mailbox data and can be opened only in Outlook.

Most users want to export the OST files into PST file format. There are several reasons for migration. Let us explore the reasons for the migration.

Why Should You Convert OST to PST File Format

Usually, there are several reasons for the OST to PST migration. Sometimes, users have their reasons for file conversion. But most of the time, the following are the scenarios when you want to change the file format.

  • When you delete some mailbox items over the Exchange server, it makes the OST file inaccessible. So, you can not open these files for offline use.
  • If you want to save some mailbox items, you should convert OST to PST files because the PST file formats are suitable to backup mailbox data.
  • There are many issues with the server that makes the OST files inaccessible. Some problems are Exchange corruption, server crash, data breach, etc. In these cases, you need to save your valuable data by converting the file format.

How to Export OST to PST File Format

You can change OST to PST files using various methods. The two options available are free methods and paid methods. The former option is suitable for users who have good technical knowledge. They must be able to perform the complicated steps. However, the latter option is a fast and effective solution for everyone.

Convert OST to PST file through Microsoft Outlook

#1. Use Export Feature of Outlook

The first method to convert the Exchange OST file to PST is by using the Export option of Outlook. Follow the steps below to migrate the files.

  • Login to Microsoft Outlook with Exchange ID.
  • Click on the File option in the menu bar.
  • Choose the Open & Export tab and then select the Import/Export icon.
Convert OST to PST
  • It will open a new wizard. Now, choose the Export to a file option from the list and press Next.
Convert OST to PST
  • After that, choose the Outlook Data file (.PST). Click on the Next button.
Convert OST to PST
  • Opt for the desired mailbox folder and press the Next option.
Convert OST to PST
  • Now, browse the location where you want to save the mailbox items as a PST file. Press the Finish button to complete the procedure.

#2. Use Auto Archive Option in Outlook

Another technique to convert OST to PST file format is through the Auto Archive feature in Microsoft Outlook. After you enable this option, Outlook runs the auto-archiving at a regular interval and saves the mailbox items as PST files. Also, after creating the backup, Outlook deletes the older emails to clean the mailbox and free up space. Follow the steps below to activate this feature.

  • Open the Microsoft Outlook application and click on the File option in the top menu.
  • Choose the Options tab, and it will open a pop-up window on the screen.
  • Select the Advanced option from the left pane and click on the AutoArchive Settings.
  • In the next window, select the frequency of the Auto Archive and fill in other details. Press the OK button to complete the procedure.

The above two methods will convert the Exchange OST file to PST file format. However, there is a more advanced solution for file conversion.

Migrate the OST Files into PST File Format Without Outlook

Cigati OST to PST Converter Software is a one-stop solution for converting the OST files into various desired file formats and email clients easily. This software is loaded with different exclusive features and designed considering the modern user’s requirements to convert OST to PST files. This software has an interactive graphical user interface that does not require any prior technical expertise. Now, you can convert the files by following the steps below.

  • Download and install the Cigati OST Converter. Run it as administrator.
ost to pst converter tool
  • Click on the Browse button to locate the desired OST file.
  • Now, choose the particular OST file for conversion and click Open.
  • After that, you will see the mailbox preview. Opt for the required items and proceed further by pressing the Next button.
  • Select the PST file format in the Save/Backup/Migrate As field.
  • Now, select the additional features, filters, and custom naming options in the tool.
  • Assign a destination to the resultant folder by the Path to Save button.
  • At last, click on the Convert button to start the migration.


The PST file format has various advantages over OST files. So, most users search for ways to convert OST to PST files. Now, you can migrate the OST files through Outlook. But the procedures are complicated for new users. Another technique to export the OST to PST files is using an advanced method. In this method, you can migrate the files without Outlook. Cigati OST Converter Software is the perfect solution for OST to PST migration.

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