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Written By Amit Chandel
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Updated on October 16th, 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.
Opening OST files without Microsoft Outlook can be necessary in various situations. Some common scenarios include:
In such cases, a specialized tool or methods are required to open the contents of OST files without Microsoft 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:
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.
For a direct method, you can use the OST File Viewer 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.
If you want to save the OST File in another file format and the email client, then follow the below methods:
Explore More: Convert OST to MBOX
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.
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.
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.
Ans: Use the MailConverterTools OST Viewer to access your data files without actual installation of Microsoft Outlook on your system. It enables you to view multiple files at a time and retain their integrity providing a clear data access.
Ans: No. The integrity of the OST file is completely preserved even if you open it without Outlook using the OST File Viewer Software. The tool focuses on data fidelity and clean preview without much efforts.
About The Author:
Meet Amit, an experienced SEO expert and content planner. He uses his creativity and strategy to create content that grabs attention and helps brands reach their goals. With solid skills in digital marketing and content planning, Amit helps businesses succeed online.
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