How to Perform OST to PST Conversion on Mac & Windows

Written By Mark Herry
Updated on May 2nd, 2025

Summary: OST to PST Conversion is often required when you need to access Outlook data in a different environment or restore mailbox content from an inaccessible Outlook profile. Since OST files are bound to specific accounts and profiles, you can’t open them directly in another Outlook setup. Hence, it’s better to convert OST file into PST format to make the data usable. This process keeps all essential emails, contacts, calendars, and more during the OST to PST conversion. If you’re looking for a simplified way, then you can use the OST to PST Converter to accomplish the task. This blog explains the best ways to convert OST files to PST for free on both Mac and Windows platforms.

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Table of Contents

Top Reasons for Converting OST Files to PST

There are several situations where converting an OST file to PST is essential. Here are some of the main reasons to convert Outlook OST file to PST:

If your Outlook profile is deleted or not working, you need to convert it to PST to get your emails back.
When you move to a new device, it becomes essential to convert your OST file to PST. It helps you move your data easily.
Many users convert OST files to PST to keep a safe backup. It helps protect your emails. Hence, it can be easy to restore them later.
If the Exchange Server is down or you’re offline, the PST file gives you the option to open and read your important emails.
If you have an old OST file that’s not connected to any account, Outlook won’t open it. It can also be the reason for converting OST to PST.

Best Solutions to Perform OST to PST Conversion

There are various solutions to perform this conversion smoothly. In the upcoming section, we will explore the top methods to help you convert your OST file to PST effortlessly. Go through the given methods for converting OST files to PST:

Method 01: Using MS Outlook to Convert OST to PST Free

If you’re using Outlook on Windows, you can easily export your OST file to PST format using Outlook’s built-in export feature. This method is simple and works well if your OST file is not corrupted. Follow these steps to accomplish the OST to PST Conversion:

Launch the Outlook application on your Windows system.
Click on File in the top-left corner of the Outlook window.
From the given options, pick the Open & Export.
Pick Import/Export to open the Import and Export Wizard.
In the next wizard, select Export to a file >> Next.
Now, select Outlook Data File (.pst) and click Next.
Select the mailbox folders you want to export.
Browse and select a destination to save the PST file.
Lastly, enter a name for the PST file and hit Finish.

Important Note: However, individuals should keep in mind that this approach works only for non-corrupted OST files.

Method 02: AutoArchive Feature to Convert OST Files to PST for Free

This method helps you save mailbox content into PST format using Outlook’s built-in archiving. Here are the given steps to use the Archive feature for OST to PST conversion:

Again, open Microsoft Outlook on your existing PC.
Tap on File at the top and select options from the menu.
In the Outlook Options window, click Advanced in the left-hand pane.
Scroll down to the AutoArchive section and hit AutoArchive Settings.
Choose the option Archive items in this folder using the default settings.
To complete the conversion, Outlook will archive the data and save it in PST format.

Note: This method doesn’t export contacts, calendar, or other non-email items. It may not be appropriate for users with large amounts of data or complex conversion needs.

Challenges of Converting OST to PST Manually

Here are some key obstacles users may encounter when attempting to convert OST files to PST manually:

It requires Outlook and an active Exchange profile.
There is no option to convert OST to PST on Mac.
It can’t be used for orphaned or corrupted OST files.
Moreover, it doesn’t support bulk OST to PST conversion.
Along with that, you will not get the additional options.

Method 03: Best Way to Convert OST File to PST without Outlook

If you want to convert an OST file to PST without using Outlook, the CloudMigration OST to PST Converter Tool serves as a highly effective alternative. It can quickly perform the conversion process without installing Outlook on your system. It is useful for handling corrupted OST files, something that Outlook cannot always manage. You can convert multiple OST files at once and keep your data safe, including emails, folders, and attachments. Additionally, this utility works on both Windows and Mac. Hence, it is more flexible to use.

Simplified Steps to Complete the OST to PST Conversion

Download and open the CloudMigration OST to PST Converter Tool.
After that, click on the Select Files to choose and add the OST files.
Now, you can preview the tree-structured format of the OST data.
Pick PST as the output format from the Save/Migrate/Backup As option.
Select the preferred location to save the resultant PST file format.
To complete the OST to PST Conversion, click on the Convert Button.

Additional Tips: If you need your Outlook data in a document-friendly format, you can also convert OST to PDF. Alternatively, you can export OST to MSG to maintain email compatibility across different platforms.

Final Words

OST to PST conversion is necessary when dealing with inaccessible Outlook profiles. However, Outlook offers limited manual options for Windows users; they don’t work on Macs or with orphaned OST files. A professional OST to PST converter provides a simple, effective way to convert OST files to PST without Outlook on Mac or Windows. For hassle-free migration, using this advanced utility is the most reliable solution.

Frequently Asked Questions

Q1. How to Convert OST to PST Free?

Ans: To convert OST to PST free, use the demo version of OST to PST Converter and follow the given steps:
1. Download & install the tool on your system.
2. Launch it and click Add OST File(s).
3. Next, you can review the mailbox data.
4. Now, choose PST as the output format.
5. Set the destination path and click Convert.

Q2. Can I convert an OST file to PST in bulk?

Ans: Yes, using a professional tool like the Cloud Email Migration OST to PST Converter, you can convert multiple OST files to PST at once.

About The Author:

Mark Herry