How to Open OST File Without Outlook? Complete Steps

Written By Priyanka Kumari
Updated on March 8th, 2025

OST (Offline Storage Table) files are Microsoft Outlook data files that store copies of your mailbox data. However, you can open your OST file in MS Outlook, unless the OST file is inconsistent. When it comes to accessing the contents of an OST file without Outlook, it can be complex, especially if the file is corrupted.

In this blog, we will explore various methods, including the OST Viewer to open OST file without Outlook. These techniques will enable you to open OST files created by different Outlook versions and ensure your data remains accessible.

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Why Do You Need to Open OST Without Outlook?

Opening OST files without Microsoft Outlook can be necessary in various situations. Some common scenarios include:

When Outlook is not installed on your system, you need to access the OST file data.
If Outlook crashes or is unresponsive, you need to access your data without launching the application.
Sometimes, users switch to a new device and want to access their emails without Outlook.
When the email account associated with the OST file has been deleted, it prevents access through Outlook.

In such cases, a specialized tool or methods are required to open the contents of OST files without Microsoft Outlook.

Convert OST to PST to Open OST File Without Outlook

This method only works if Outlook still accesses the OST file. You can convert OST to PST, and then open it. This process requires technical skills and a good understanding of MS Outlook. Here is how to perform it:

Firstly, open MS Outlook on your system.
Now, click on File and select Import/Export.
After that, Export to a File and click Next.
Choose Outlook Data File(.pst) & Next.
Further, select the folder to convert. Next.
Define the location and finish the process.

Important Note: Using the manual method can open your OST file without Outlook. However, this method is not applicable when you have large OST files and also comes with other restrictions. In the upcoming section, we discuss how to avoid these limitations.

Challenges of Manually Reading OST File Without Outlook:

Chances of losing data, originality, and privacy.
Errors may have occurred while performing.
Takes too much time for large OST files.
Must require MS Outlook on your system.

Reliable Method to Open OST File Without Outlook

For a direct method, you can use the OST Viewer Tool to open the OST file without relying on Outlook. You can use this utility without technical knowledge. Also, there is no need to install MS Outlook. Along with that, if you want to open multiple OST files at once, this tool is also applicable to this. With the help of this software, you can save your OST file in 15+ file formats and email clients. For more details about the tool’s features, continue reading the following section.

Simple Steps to View OST File Without Outlook:

Open the OST Viewer Tool on your PC.
Now, click on Open to add the OST file.
Use opt features as per your need>> click OK.
Then, double-tap to preview the content.

If you want to save the OST File in another file format and the email client, then follow the below methods:

Now, select the OST file/folder you want to convert>> Next.
After that, choose the Saving Format from the given list.
Apply advanced features based on your requirements.
Lastly, click on Convert to initiate the conversion process.

Exclusive Features of Using OST Viewer:

Helpful to open or read corrupt OST files.
Ability to view all the data including emails, contacts, and attachments.
Simple interface, easy to understand and operate.
No need to install MS Outlook & Exchange Server.
Highly compatible with all Windows OS.

Explore More: Convert OST to MBOX

Conclusion

While Outlook is the primary tool for opening OST files, but when Outlook is not working. You can also use an OST viewer to open OST file without Outlook. Before opening the OST file, make sure to back up your data. If the OST file is corrupted, you can directly use the recommended tool. Try the free demo version to explore its functionality before making a purchase. For any queries, feel free to reach out for assistance.

FAQ

Q1. How do I read OST File without Outlook?

Ans: Follow the given steps:
1. Firstly, download and run the OST Viewer Tool.
2. Click on Open to add OST file, press OK.
3. Then, double-click to view the content of OST file.

Q2. Can I read a corrupted OST file?

Ans: Yes, with the help of the OST Viewer Tool, you can open or read a corrupted OST file. It allows you to choose the recovery mode and different file formats to save the corrupted OST file.

About The Author:

Priyanka Kumari

Priyanka Kumari is a technical content writer in the fields of Email Migration, Data Recovery, Cloud Migration, and File Management. She is dedicated to simplifying complex technology terminologies for all users. Her articles and guides demonstrate her commitment to streamlining email management for professionals or businesses of any size.