How to Easily Convert OST to PST in Bulk?

Written By
Abhishek Singh

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Updated on
November 7, 2025

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6 minutes Read

Summary: The Outlook Exchange server saves its files in OST (Offline Storage Table) format. However, we all agree that the OST files are not dependable as it is prone to corruption, especially when Outlook crashes, sync fails, or your system shuts down abruptly. Therefore, it’s best to keep them safe in a more reliable and portable format, PST. Now, you might be wondering how to convert OST to PST. Thus, it’s the right article for you. Here, we will uncover the free methods  & premium MacSonik OST to PST Converter for this conversion.

Workflow to Convert OST to PST with Attachment

1. Run the Macsonik tool and use Select Files to import your OST file(s).
2. Then, preview and select the items you want to convert.
3. After that, select PST as the output format and choose a save location.
4. Lastly, click the Convert button to start the process.

Primary Factors to Save the OST File as PST

Every individual or business has a different reason to make this conversion happen. However, below are the top causes to save your .odt data files to a more secure .pst.

• Migrate Data to a new computer or profile.
• Create a Permanent Backup for archiving.
• Switch from Exchange to a standard email account.
• Recover Data from a corrupted OST file.
• Maintain Access after leaving a company.
• Share Mailbox Data with others easily.

Most Dependable Ways to Convert OST to PST

It is important to keep your data safe. Plus, having the right method for that is the key. Thus, below here we have covered the most reliable ways to export OST file to PST.

Way 01. With Oulook’s Import/Export Feature

MS Outlook provides an in-built feature to move your OST files to another format. It is best for users who still have access to their Outlook profile connected to the Exchange server.

1. In Outlook, navigate to File > Open & Export > Import/Export.
2. After that, select Export to a file & press Next.
3. Next, choose Outlook Data File (.pst) and hit Next.
4. Further, select the specific mailbox folders you want to export.
5. At the end, choose a save location and click Finish to complete the export.

Result: This method creates a PST file that can be imported into another Outlook account.

Way 02. With Outlook’s Archive Feature

This method works very well when you want to save only your old emails to the .pst format.

1. Start with, navigate to File > Options > Advanced.
2. Next, click AutoArchive Settings.
3. After that, configure your preferences:

• Select which folders to archive.
• Set the destination as a PST file.
• Adjust age and action settings.

1. Finally, click OK to activate automatic archiving.

Result: Outlook will automatically move or copy older emails to the specified PST file based on your configured schedule and rules.

Way 03. Drag & Drop to Convert OST to PST

This technique works very well for the small-scale or selective conversion of OST data.

1. Open Microsoft Outlook on your computer.
2. Create a new PST file with File > New Items > More Items > Outlook Data File.
3. Next, name your file and choose a save location, then click OK.
4. Then, locate the items you want to convert in your OST mailbox.
5. Lastly, drag and drop the selected emails or folders into your new PST file.

Result: Your chosen data is successfully copied into a PST format without needing external software.

These first 03 methods are cost-free. However, these free methods are not suitable to convert OST to PST in bulk.

Limitations with Cost-Free Methods

• These don’t work for orphaned or disconnected OST files.
• Plus, they are time-consuming with big mailboxes.
• Also, may miss contacts, calendars, or subfolders
• Additionally, no batch conversion capability
• Subsequently, potential for lost attachments or corruption
• Onto that, these are not beginner-friendly.

However, to batch convert your OST files with attachments in PST format, we recommend the next method.

Way 04. Professional Way to Convert OST File to PST

To convert to .ost data in bulk, the Macsonik OST to PST converter is the best solution. This tool provides you with many saving options while ensuring that your metadata remains safe and sound. It provides multiple advanced features to import your OST files.

Why MacSonik OST to PST is Best?

• Complete Conversion – All items converted with zero data loss.
• Preserves Structure – Maintains original folder hierarchy.
• Multiple Formats – Export to PST, MBOX, EML, PDF, etc.
• Preview Feature – Selectively convert after previewing data.
• User-Friendly – Works on Windows/Mac, no technical skills needed.

Easiest Process to Convert OST to PST

1. Launch the OST to PST Converter tool.

2. Then, click Select Files and add your OST files.

3. After that, choose the desired mailbox items from the preview list.

4. Now, select PST as the output format and set the save location.

5. Hit Convert to export OST files to PST.

Now, you have converted all your OST files into more reliable PSTs.

Closing Remarks

When you want to convert OST to PST for critical data, Macsonik OST to PST Converter stands out as the most reliable and efficient solution. It ensures:

• Complete data preservation with zero loss of emails, attachments, or folder structure
• Bulk conversion capability, saving time and effort
• User-friendly operation, requiring no technical expertise

For urgent, large-scale migrations like yours, Macsonik guarantees a seamless and secure transition, making it the top choice for professionals who cannot afford compromises.

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