OST to PST Converter

Convert Outlook OST files to PST format online for free. Perfect for recovering emails from orphaned OST files.

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About This Tool

This OST to PST converter allows you to convert Outlook OST (Offline Storage Table) files to PST (Personal Storage Table) format directly in your browser. OST files are created by Microsoft Outlook when using Cached Exchange Mode or working offline, but they can become inaccessible if the Exchange account is removed. Our tool helps you recover emails, contacts, calendars, and other data by converting OST files to the standard PST format that can be imported into any Outlook installation. The conversion preserves folder structure, email metadata, and attachments.

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How to Use

Click the upload area or drag & drop your OST file
Select your preferred PST format (Unicode or ANSI)
Choose whether to include attachments in the conversion
Click the 'Convert OST to PST' button
Wait for the conversion to complete
Download your converted PST file

Frequently Asked Questions

Find Quick Answers

What is the difference between OST and PST files?

OST (Offline Storage Table) files are local copies of Exchange mailbox data used for offline access in Outlook. PST (Personal Storage Table) files are standalone data files that can be moved between computers and imported into Outlook.

Will my email attachments be preserved in the conversion?

Yes, all email attachments are preserved during the OST to PST conversion process. You can choose to include or exclude attachments based on your needs.

What PST formats are supported?

The converter supports both Unicode PST format (for Outlook 2003 and later) and ANSI PST format (for older Outlook versions). Unicode format supports larger file sizes and international characters.

Is there a file size limit for conversion?

The tool can handle OST files up to 2GB in size. For larger files, consider splitting your OST file before conversion or using desktop software.

Is my data secure during conversion?

Yes, all file processing happens securely on our servers and uploaded files are automatically deleted after conversion. We do not store or access your email content.

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