Free OST to PST Converter

Experts verified software to convert multiple OST files to PST format. It flawlessly restores inaccessible and corrupt OST file items and exports them to healthy PST file. You can use this tool for converting OST to PST, EML, MSG, MBOX, EMLX, NSF, PDF, vCard, CSV, ICS, HTML, TXT, DOCX, MHT, RTF & DOC file format.

Free OST to PST converter tool is powerful application to convert inaccessible OST files into Outlook data file format. The tool trusted by MS MVPs for exporting mailbox components: emails, contacts, attachments, and calendars.

Converter Features

  • Convert Large OST Files to PST Format Easily
  • Export OST File: Calendar, Contacts, Attachments, Etc.
  • Exchange Profile & Server Connectivity Not Required
  • Filters Options for Selected Items Conversion
  • Convert OST to PST and 14 Other File Formats
  • Free Download OST to PST Converter for Windows OS
  • Convert Inaccessible & Orphaned OST to PST Format
  • Maintains Folder Structure Even After Conversion
  • Convert Another User's OST File in Healthy PST File

Why Should You Choose Free OST to PST Converter Software?

OST stands for Offline Storage Table, it’s an offline data file of Outlook and is created when Outlook is used with conjunction of Microsoft Exchange Server and cached Exchange mode of Microsoft Exchange Server is enable. This type of data file provides facility to work offline even in downtime of Exchange Server and when connection becomes available synchronization takes place and all changes done by user will reflect on Server end. However, Exchange OST file also faces multiple issues and prone to corruption which necessities OST to PST Conversion. In order to access inaccessible data, download OST to PST converter software to extract & save OST data into other file formats. Sometimes there exist synchronization issues while trying to synchronize OST with exchange server mailboxes data. Apart from that, one cannot access OST file outside of its original MAPI profile. This data file generates various errors and cannot be accessible directly in Outlook.

Free OST to PST Converter Software - Features

ost to pst converter online free

Convert Large OST to PST

Free Converter for OST to PST allows users to migrate OST file and create an individual UNICODE PST file for each Mailbox of Database. Software performs conversion by keeping secure all Mailbox, calendar data, tasks, journals, etc.

free download online ost to pst converter software

Create PST of Required Size

Software provides a provision to split larger PST file into small parts. Sometimes handling large file becomes tedious task. It has ability to export the selected data from source OST and evenly splits it in smaller PST files of the specified size. Download free OST to PST converter tool.

ost to pst converter free download full version

Outlook Installation Optional

You need to just download OST to PST Converter free version to extract data from OST file and save in PST format without installation of Outlook. Outlook and Exchange Server connectivity is not required in order to access OST file in some other reliable file format.

ost to pst converter tool download

Maintains Original Mail Attributes

After installation of free OST to PST converter wizard, you can perform conversion in your own guidance. Software is designed to keep care original formatting of Outlook data file, Meta properties like To, Cc, Bcc, sent date, received date.

ost to pst converter free tool

Apply Different Filters

Provides Mail Filter option to save converted email. It allows different naming convention like;(DD-MM-YYYY), (MM-DD-YYYY), (YYYY-MM-DD) to save the messages while saving them. Users can change the file name of their messages while saving OST emails in EML and MSG format. After conversion of OST files in PST format, the tool will save data as per selected options.

ost to pst converter online free

Easy to Use Software GUI

GUI interface of this OST to PST converter free software is self explanatory, any novice user who is not much technically inclined can use this software in their own guidance. A novice use can download this converter tool and easily convert OST files into PST format.

Free OST to PST Converter Specifications

Use the Free Trial Version to Know How to Convert OST Files to PST Without Outlook

Software Download

Size : 36.3 MB

Version : 8.0

Trial Limitations

Free Demo version will generate Preview of complete data & Export only 25 Items per Folder. To convert complete data, buy OST to PST converter full version. It is capable to convert OST to PST, PDF, vCard, CSV, ICS, TXT, HTML, MHT, DOCX, DOC, RTF, MBOX, MSG, EML, EMLX, and NSF.

System Specifications

Hard Disk Space
100 MB of free hard disk space required

4 GB of RAM (4 GB is recommended)

Intel® Core™ 2 Duo CPU E4600 @ 2.40GHz 2.39GHz


  • Microsoft .NET framework 4.5 or above
  • If you are using Windows 11 (64-bit), Windows 10/8.1/8/7, then please launch the tool as "Run as Administrator".

Supported Editions

    Windows 10, 8, 7 (32 bit or 64 bit) & Windows Server 2016, 2012 R2, 2008

    Compatible with Microsoft Outlook 2000, 2003, 2007, 2010(32/64 bit), 2013 (32/64 bit), 2016 (32/64 bit), 2019 (32/64 bit)

Product Guides

Electronic Delivery

The product delivery is automated. You will receive an email with the link to download the product and the activation key within a few minutes after the payment has been confirmed.

Frequently Asked Questions

5 steps to export OST files to PST format in bulk:

  • Step 1: Download Free OST to PST converter and Install
  • Step 2: After that, Navigate OST file using tool panel
  • Step 3: Now preview OST file data into application panel
  • Step 4: Choose PST radio button and hit on export
  • Step 5: Save exported file into .pst format after conversion

Yes, the tool simply repairs extremely damaged, corrupted, inaccessible, and orphaned Offline data files.

Yes, the tool is supports all versions of Windows OS. A free trial version of Free OST File Converter is also available.

Yes, the tool keeps the folder structure and meta-data properties after the conversion.

Client Reviews of OST to PST Converter

Exchange OST to PST Converter is a free tool which can easily and quickly downloaded and convert multiple OST file to PST file without altering original mail attributes. Using the software, we were able to split larger PST file into small parts without tampering the integrity of Data.

Chris Kimona

Tom Naumann, Utah

"The most amazing feature about Microsoft free OST to PST Converter is that the software will not affect the originality of OST file after exporting multiple OST files. You can easily download this free tool to make your own experience."

Willium Andrew

Jonas Lundberg, Swede

"Now download OST to PST converter is available free of cost to deals with extraction of OST data & save into PST format. It's a superb utility which smoothly converted all OST files to PST format. Thanks to developer team."

Willium Andrew

Justin, Sydney

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