OST to PST Converter Software

Guide for Win

Guide for Mac

FreeViewer OST to PST Converter

Best OST converter software capable of converting OST to PST format with complete data integrity. This OST to PST converter is verified by Microsoft MVPs and recommended for reliable for conversion of OST to PST file format.

(Average Rating 4.5 Based on 25 Reviews)
  • Convert OST to PST and Other Mail Format: MSG, EMLX, EML, MBOX, NSF
  • Export & Save in PDF, vCard, CSV, ICS, HTML, RTF, DOC, DOCX, MHT, TXT
  • Convert Large Size OST Files into PST Format without Any Size Limitation
  • Preview Data Items: Emails, Contacts, Attachments, Calendars, Tasks, Journals
  • Convert Encrypted(S/MIME & OPENPGP) OST Files into PST Format
  • Exchange Profile and Server Connectivity Not Required for Conversion
  • Convert Offline and Orphaned OST Files into PST Format For Outlook
  • Download OST to PST Converter and Install It on Windows or Mac OS

OST to PST Converter Tool - Awards

Best Rated and Popular Software to Convert OST to PST File

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When Do You Need to Convert OST to PST?

An OST (Offline Storage Table) file is stored locally on a user's computer and works in synchronization with Exchange Server and IMAP accounts. However, it's tightly linked to the original Outlook profile and cannot be opened independently if the profile or server connection is broken. But at the same time PST file is accessible without any restrction. It force use to export the data from OST file and save into PST format.

Specific Scenarios That Trigger Conversion

  1. Exchange Server crash or downtime
  2. Orphaned or inaccessible OST files
  3. Migration to a new Outlook profile or system
  4. Need to access mailbox data without Exchange connection
  5. Backing up or archiving OST data
  6. Preparing email data for legal or forensic use

Here FreeViewer OST to PST converter become quite useful in all above scenarios. It is a all-in-one software to make OST file portable, importable, accessible.

OST to PST Converter Tool - Key Features

Top Software's Features to Convert OST File to PST Format

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Convert OST File Complete Data

OST converter software is capable enough to convert OST to PST format with all data like emails, contacts, calendars, tasks, journals, etc. User can verify the content of source OST file with the exported PST file.

Save Scanned Report

Save Scanned Outlook OST File

OST to PST converter software scans the browsed OST file and gives users the option to save the scanned data. This feature helps save time—when the same OST file is added again in the future, the software instantly loads the OST file data into the software panel without re-scanning.

Export Selective emails

Export Selective Data from OST Files

This OST to PST Converter software allows users to selectively convert emails and other mailbox items from an OST file. Each email has a checkbox next to it, so users can simply select the items they want to convert. The software will then export only the selected data, ensuring that only the required information is converted from OST to PST format.

Date Filter Option

Provides Date Filter Option

Using Date Filter option users can convert data from a specific time period from the OST file to PST format. This feature makes the software more efficient and saves valuable time. Once the conversion is done, the resulting PST file is well-organized and doesn't require any extra management. Users can also apply multiple date range filters at the same time for more precise OST file conversion.

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Convert Corrupt OST Files

If OST file is corrupted then it cannot be accessed directly. In such cases, this software scans the damaged OST file and then converts it into PST format. Resulting PST file is completely free from corruption and can be accessed without any issues. This feature can also be tested using the free demo version of this OST to PST converter software.

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Provides Different Preview Modes

Before converting an OST file to PST format the software allows users to preview the complete data within software UI. Software interface offers 8 different preview modes, including Normal Mail View, Hex, Properties, Message Header, MIME, RTF, and Attachments. Users can select any mode, and the corresponding data will be displayed for detailed analysis.

short email data

Short Emails in Software Panel

OST to PST converter software offers a unique feature that allows users to sort emails before conversion. In preview panel, users can click on columns like From, Subject, To, Sent Date & Time, Received Date & Time, or Size to sort the emails accordingly. This feature is especially useful when users need to analyze or review specific data before performing OST file conversion.

Folder Structure

Maintains Folder Hierarchy

OST to PST converter is an excellent tool that preserves original folder structure of source OST file during conversion. Resulting PST file maintains same folder hierarchy. Making it easy for users to navigate and retrieve data after OST conversion. This ensures a smooth and organized experience without any confusion or data loss.

convert email with attachments

Maintains Data Integrity

OST to PST converter software ensures that all email metadata and data integrity are fully preserved during conversion process. It maintains original email properties—such as To, From, Subject, Date, and other attributes—so output PST file retains exact structure and details of original emails.

Folder Structure

Available for Windows & Mac OS

FreeViewer offers separate OST to PST converter software versions for both Windows and Mac operating systems. Users can download appropriate version based on their OS. Software is compatible with all major versions of Windows and macOS, and users can test OS compatibility by using the free demo version before purchasing.

Preserves Metadata

Option to Search OST File

If a user doesn’t know the exact location of OST file on their system. OST to PST converter software provides a built-in search feature. By using it, software automatically scans system to find all available OST files and displays them. User can then select the desired OST file from the list and proceed with scanning and conversion.

Folder Structure

Create Required Size PST File

If OST file is too large, this OST to PST converter software allows users to specify the size for output PST file. During conversion process software will automatically split PST file according to defined size limit. To use this feature, users just need to open Advanced Settings window and set the desired size.

Preserves Metadata

Select Category and Convert OST

OST to PST converter software provides a Category Selection feature that allows users to choose specific types of data for conversion. Users can simply check checkboxes next to categories they want to export—such as Emails, Contacts, Calendars, Tasks, Journals, or Notes. Software will then convert only selected data, making process faster and more focused.

Folder Structure

Save Output PST at Desired Location

Once conversion process is complete user can choose a specific location to save output PST file. Software will then save PST file to that selected path. If no location is provided, OST to PST converter tool will automatically create a new folder on desktop and save PST file there by default.

OST to PST Converter Software - Specifications

Free Download Tool to Convert Offline OST Files to PST File Format

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Trial Limitations

Limitations
OST to PST converter Free demo version will generate Preview & Export only 25 Items per Folder.
Note: To Export Contacts, Calendars, Tasks, Notes, Journals from OST into PST format, Check 'Use Outlook (Outlook must be installed)' option on Export Option Window.

System Specifications

Hard Disk Space
100 MB of free hard disk space required

RAM
4 GB of RAM (4 GB is recommended)

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

Application Pre-Requisites

Pre-Requisites
Microsoft .NET framework 4.5
To decrypt SMIME encrypted Emails, Certificates and respective passwords are required
To decrypt OPENPGP encrypted Emails, Private Keys and respective passwords are required

Supported Versions

Microsoft Windows
Windows 11 (64-bit), 10, 8, 7 (32-bit or 64-bit) & Windows Server 2022, 2019, 2016, 2012 R2, 2008

Microsoft Outlook
Compatible with Microsoft Outlook 2000, 2003, 2007, 2010, 2013, 2016, 2019, 2021 (32/64 bit)

FAQs

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OST to PST Converter Tool - Comparison

Get an Overview of The OST Converter Tool – Free VS Full Version

Features Free Version Full Version
Add OST File of Any Size
Quick and Deep Scan Option
View All Emails with Attachments
Support Outlook 2019, 2016, 2013, 2010, 2007, 2003, etc.
Support Exchange Server 2019, 2016, 2013, 2010, etc
Split Large Data File
Convert OST File to PST Export 25 Items/Folders All Items
Convert Orphaned OST to PST Export 25 Items/Folders All Items
Convert Offline OST to PST Export 25 Items/Folders All Items
Cost Trial $49

Frequently Asked Questions

How to Convert OST to PST Format? - Get Solution

How Does the OST to PST Converter Tool Works?
5 Easy Steps to Convert orphaned OST to PST Format:
  • Step-1: Free Download OST to PST Converter Software and Install
  • Step-2: Click on "Add File" and "Browse OST File" from Local Folder
  • Step-3: Choose "Quick Scan" for Minor or "Advance Scan" for Major Corruption
  • Step-4: Select Outlook OST File Data Items and Click on "Export" Button
  • Step-5: "Apply Filters" to Convert Orphaned OST to PST Format
Yes, you can easily export offline d OST to PST file format.
It depends upon the amount of data being converted. This OST converter tool is capable enough to deal with large sized mailbox. Moreover, there is no file size limitation imposed by the tool.
Partly Yes, though you will be able to view everything that exists inside your .ost file but in order to make the conversion you have to purchase the software.
Outlook .bak file is the replica of OST file. Users can get emails, calendars, contacts and other data items from the .bak file by using this OST to PST converter. Moreover, this tool supports Outlook .bak file conversion to PST, EML and MSG format.
Yes, OST to PST Converter tool is compatible with all the versions of Windows operating system such as 11, 10, 8, 7, Vista, XP and works great with them.
If you want to migrate ANSI OST file to UNICODE PST then you can use this OST converter tool. It supports both ANSI and UNICODE OST file and generates PST in UNICODE format. So, users can easily perform migration of OST files within few clicks.
The OST to PST conversion software supports all Windows OS including 7, 8, 8.1 10, and 11. Also, it is compatible with all Microsoft Outlook versions such as 2007, 2010, 2013 and 2016, 2019, etc.

What Customers Are Saying

Get User Reviews of OST to PST Converter Tool

4.5
25 Ratings
5 Star
80%
4 Star
4%
3 Star
8%
2 Star
0%
1 Star
8%

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