How to Convert Microsoft Outlook OST to PST Format Manually in 2025?

[Amrita]

If you're looking to convert an OST (Offline Storage Table) file to PST (Personal Storage Table) in MS Outlook, there are a few options available. However, it's important to keep in mind that while manual methods may seem convenient, they have their limitations and can sometimes lead to data loss or incomplete conversions. To ensure a smooth process, it's recommended to back up your mailbox data before proceeding with any conversion.

Manual Methods to Convert OST to PST:

Method 1: Using Auto Archive Settings in Outlook

Microsoft Outlook provides an auto-archive feature that helps users convert OST files into PST format. While this method is effective for moving items from the OST mailbox, it does not archive contacts. Here's how you can use the Auto Archive settings:

1. Open the MS Outlook application.
2. Click on the File tab and then select Options.
3. In the Outlook Options window, go to the Advanced section.
4. Click on AutoArchive Settings.
5. A pop-up window will appear where you can enable the required settings for archiving your OST data.
6. After selecting the appropriate options, click OK.

This will save the items from your OST file into a PST file, based on the archive settings you’ve chosen.

Method 2: Exporting OST to PST Using the Import/Export Feature

Another manual method for converting an OST file to PST is through Outlook's Import/Export feature. Here's how to do it:

1. Open Outlook and go to the File tab.
2. Select Open & Export, then click on Import/Export.
3. Choose Export to a File, then click Next.
4. Select Outlook Data File (.pst) and click Next.
5. Choose the folder you wish to export, then click Next.
6. Click Browse to select the destination path for the new PST file.
7. Configure the duplicate options as necessary and click Finish.
8. If desired, set a password for the PST file, then click OK.

This method is simple but can be time-consuming, especially if the OST file is large.

Drawbacks of Manual Methods

While the manual methods above may help you convert OST files to PST, they come with several limitations:

• Time-Consuming: These methods can take a lot of time, especially if the file size is large or if there are multiple folders.
• Risk of Data Loss: Manual conversion processes do not guarantee the preservation of all mailbox items, and there’s a risk of data loss if the process is not followed correctly.
• Complex Process: The steps involved can be complex for users who are not familiar with Outlook’s features. A mistake during the process may result in an incomplete or unsuccessful conversion.
• Limited to Non-Corrupted Files: These methods only work if the OST file is intact. If the file is corrupted, the manual methods won’t be able to help.
• No Support for Large OST Files: If the OST file exceeds a certain size, the manual conversion methods may fail, leaving your data unconverted.

Recommended Professional Tool: Regain OST to PST Converter Tool

Given the limitations of manual methods, many professionals recommend using specialized tools like Regain OST to PST Converter. Unlike the manual methods, this professional software simplifies the entire process, offering a more reliable and faster solution for OST to PST conversion.

Advantages of Regain OST to PST Converter Tool:

• No Data Loss: The software ensures the safe conversion of all mailbox items without any risk of data loss.
• Efficient Conversion: It’s much faster compared to manual methods, especially for large OST files.
• Works with Corrupted OST Files: Even if your OST file is corrupted, Regain OST to PST Converter can still recover and convert your data.
• User-Friendly Interface: The tool is easy to use, with a simple and intuitive interface suitable for both technical and non-technical users.
• Preserves Folder Structure: The tool ensures that all folders and subfolders are preserved during the conversion process.
• No File Size Limitations: Unlike manual methods, Regain can handle large OST files with ease.

Conclusion

While manual methods like using Outlook’s Auto Archive settings or the Import/Export feature can help convert OST files to PST, they come with several limitations such as time consumption, the risk of data loss, and complications with large or corrupted files. For a more efficient and reliable solution, Regain OST to PST Converter is a professional tool that simplifies the process, ensuring a secure, quick, and complete conversion of your OST files to PST format.