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Updated: August 2026 Expertly Reviewed by Technical Data Forensics Team

BitRecover
OST to PST Converter Tool

Enterprise-grade Offline OST to PST Converter Software for IT professionals to easily convert healthy, corrupted, encrypted, or orphaned OST files into accessible PSTs. It guarantees zero data loss and preserves complete folder hierarchy without requiring an active Microsoft Exchange Server or Outlook installation.

(Rating 4.9 Based on 2890 Verified Ratings)
  • Convert Emails, Contacts, Calendars, Journals, Tasks, and Notes from OST to PST.
  • Advanced Recovery Mode to Restore highly corrupted, damaged, or inaccessible OST data to PST.
  • Maintains original folder hierarchy, read/unread status, and email metadata.
  • Convert selective OST file data to PST and save them to desired destination path.
  • Perform single or batch OST to PST conversions without needing Outlook or Exchange Server.
  • Create ANSI or Unicode PST files of OST, compatible with all Outlook versions via MAPI.
  • Split PST to set size limit (2 gb, 5 gb, or 10 gb) and prevent PST file from becoming too large.
122,320 Downloads Since 2018 Free demo converts the first 25 items from every folder
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100% clean 100% Clean
nospyware NoSpyware
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Can I Convert OST to PST Without Third-Party Software?

Many people wonder whether they can use Microsoft Outlook's built-in Import/Export feature to convert an OST file to a PST file for free. The short answer is: Yes, but there are a few conditions.

When the Native Method Works

Although the manual method does not require any payment, it can work only if all the following conditions become true:

  • You are currently logged in to the original Exchange/Microsoft 365 account responsible for the initial creation of the OST file.
  • The Exchange server is operational and continues to synchronize data between it and your computer.
  • The OST file is not damaged and works perfectly at the moment.
When the Native Method Fails

Using the manual method can be impossible in various cases. Here are a couple of possible scenarios:

  • Orphaned OST: When the server account is off or the Exchange server is unavailable.
  • Corrupted/Inaccessible Data: Caused by a malfunctioning hard disk drive, blackouts, or too big files.
  • Batch OST to PST Conversion: Manually converting bulk of OST files to PST is not possible. It causes errors, consumes time and requires technical efforts.

In situations where you encounter a corrupted or orphaned file, Outlook will show error messages such as "The file cannot be opened". In such cases, it is strictly required to use a specialized offline OST to PST converter to retrieve the mailbox contents from the source binary file without having to authenticate to the servers.

Can I Convert OST to PST Online for Free?

We strongly advise to avoid using web-based "free online OST to PST converter tools".

Your OST file has the entire store of your mailbox, including classified business mail, contacts, calendar events, and potentially risky attachments. Hence, uploading this file online means exposing yourself to huge security risks. BitRecover guarantees 100% offline processing of your data. We ensure that your important information never leaves your computer and all the OST to PST conversion work is done offline.

Common OST Errors Resolved by Conversion

Converting OST files to PST with the best OST to PST Converter resolves specific Outlook errors

Symptom / Error Code Root Cause Resolution via BitRecover OST to PST Wizard
“Cannot open your default email folders. The file xxxx.ost is not a valid offline folder file." The OST file has become corrupt and is in such bad shape that scanost.exe cannot help it. Use the tool's Advanced Recovery Mode to create a new, usable PST.
“Outlook is using an old copy of your Outlook data file (.ost).” Problems with synchronization between the local cached copy and Exchange Server. Extract the cached OST emails into PST and then delete the old OST file.
“File .ost contains some errors” Corruption in the OST files can be caused because the file size is more than 50GB, loss of internet connection while syncing, and hardware failures. Use the Split PST feature for converting the large-sized PST files into smaller files of sizes like 2GB or 5GB or 10GB.
Exchange Server is not working or the Account is deleted (Orphaned OST) OST file made by the Exchange profile is not present in the exchange server anymore, hence making the file inaccessible. Our OST to PST tool sidesteps the requirement of the exchange profile by analyzing the file offline and storing the data into PST.

4 Quick Steps to Convert OST to PST

Learn to use our offline OST to PST Converter Software for Windows and Mac

options for PST

Customize Output PST file

Create Desired Output PSTs with BitRecover OST to PST Converter Tool

  • Individual PST for every User: During the conversion process, getting every mailbox converted into individual PST ensures good organization in the Outlook data.
  • PST Splitting: Splitting of large PST files of 2 GBs, 5GBs or 10GB ensures efficient performance.
  • Skip Folder Hierarchy: Avoid Outlook's default hierarchy for creating the PST file, which will help make a neat and clean PST file.
  • Language Selection: Use default folder names in the user's preferred language.
  • Destination Path: You can choose to keep the newly generated PST file saved in your desired location and the same can be modified.
  • Use Outlook Mode: Uses MAPI technology to create Outlook-compatible PST files.
advanced filters

Advanced Filters

Convert Specific OST file Data to PST

  • Create PST Year Wise: It will export a separate PST file for each year for maintained mailboxes and easy to navigate specific OST data.
  • Date Range Filter: Export only crucial OST data to PST based on date range.
  • From/To/Subject Filters: Select or skip specific messages based on sender, recipient or subject line.
  • Exclude Folder: Avoid unwanted OST folders such as spam, junk or any unnecessary folder to convert into PST.
  • Organizer Filter: Allows you to export specific organizer calendar data of OST to PST.
  • Root Folder Selection: Choose a custom starting folder for secure OST to PST conversion; ideal for targeting subfolders or nested directories.
Select Options

Flexible OST Selection Options

Our Secure OST to PST Converter Tool Provides Multiple Modes to Load Data

  • Auto-Detect Configured Profiles: This software can auto browse your OST file from Outlook default location without needing to be familiar with the OST file location in C Drive to convert into PST.
  • Let Me Select My Outlook Mailbox Data: This feature allows users to convert an OST file to PST, not configured with Outlook or received from any client, colleagues or other users as it allows you to select an OST file from any custom location in your internal or any external storage devices and convert into PST.
  • Use Recovery Mode: Effortlessly lets you convert corrupted, inaccessible, or damaged OST files to PST.
  • IMAP / Office 365 Connected Files: The tool properly handles OSTs generated by IMAP server connections or Microsoft 365 environments.
new features

Reliable OST to PST Wizard

Ensure Easy and Safe OST to PST Conversion on Your Computer

Auto OST File Detection

This feature comprises an intelligent detection system for OST files to help you automatically find the files in one single folder regardless of how many levels of subfolders they contain to do the conversion to PST without any problems. It finds all the OST files even in several levels of subfolders automatically, enabling you to have a bulk conversion by extracting all the found OST files in one action. This feature saves you from the need to manually search each folder in order to find the necessary files.

Background Operations

This OST to PST Converter is capable of converting OST to PST on the back end. You can run the conversion and do your work simultaneously. The software has an automatic notification about OST to PST conversion process so that you can get the notification when your PST file is ready.

Key Features

Core Functionalities of the best OST to PST Converter for Windows and Mac

fastest conversion

Fastest OST to PST Conversion

There is no built-in free solution to convert orphaned or corrupted OST to PST without Outlook. That’s why we’re introducing a quick, dependable, and error-free OST to PST software that lets you quickly convert multiple OST files to PST with just a few simple steps. The tool includes numerous features as well as full support for Windows OS and Outlook editions.

Complete OST to PST Conversion

Complete OST to PST file Conversion

For complete OST data conversion to PST, the best choice is to download OST to PST software. The tool is the best choice for fast, complete, and offline OST to PST conversion. As a standalone software, it performs the conversion process without damaging the original formatting or properties of any email item.

retain data integrity during conversion

Preserve the Integrity of Data During Conversion

The BitRecover OST to PST converter is designed to ensure that no change in the data integrity of the original OST file. The software efficiently converts the original OST file to PST file format without any errors. The structure of OST folder along with the email formats and properties will remain the same in the created PST.

Batch Conversion

Batch OST to PST Conversion

The Batch conversion process from OST to PST file is facilitated with the help of the ‘Add Folder’ option so that there is no need to convert each file separately. Multiple OST files can be placed in a single folder. To initiate the conversion, users can simply select the folder containing all OST files at once. This is a great feature that saves much time in the conversion process.

facility to choose destination path

Facility to Choose Destination Path

When the professional OST to PST Converter process is complete, the user will be given the option to select the destination path. You can save the output file anywhere on the host system by selecting the location. The user benefits from the ease of data access. The entire OST to PST conversion process will be error-free thanks to the advanced features of the offline OST to PST wizard.

Email Properties and Attachments Kept Intact

Email Properties and Attachments Kept Intact

The OST to PST tool maintains data integrity while converting data from an OST file to a PST file. Regardless of the increased OST file size or the type of data it contains, the tool will take extra precautions to keep the content safe and intact in output PST. Email attachments, email properties, and all other OST file data credentials will be preserved at the end of the OST to PST conversion.

outlook or exchange not required

Outlook or Exchange Not Required

OST to PST converter is ideal for users who want to convert OST to PST without installing Outlook. There is no need to install Outlook on the same machine for conversion. The user-friendly interface and simple steps assist the user in making the OST file accessible. It also aids in the conversion of orphaned OST to PST without the need for an Exchange profile or server connectivity.

convert encrypted and password protected files

Convert Encrypted and Password Protected files

This OST to PST wizard has the capability to export encrypted OST files to PST format, retaining key metadata and folder hierarchy. Even though the OST file is associated with any type of encryption options by Outlook, such as No Encryption, Compressible Encryption, High Encryption, S/MIME, or OpenPGP standards, the tool will still convert emails along with all attributes from OST to PST file format.

convert orphaned ost to pst

Convert Orphaned OST to PST

The most dependable OST file to PST converter software is easy to use and inexpensive. One of its most useful features is the ability to migrate orphaned and configured OST files to PST file format. Without any data loss, content modification, or other error. You can test the feature in the free demo version before purchasing the full version.

resize output file as per requirement

Resize Output file As Per Requirement

Bigger the file size, higher the chance of corruption. To avoid PST file corruption and data loss, the user can create small size output file. User can select 2GB, 5GB or 10 GB file size as per requirement. This feature is helpful for all Outlook users. You can download OST to PST wizard and install it on your computer system and easily repair OST file and convert into PST.

create separate pst file per user

Create Separate PST file Per User

For ease of email access, the option to create separate PST files per users is activated in the smart tool to convert OST file to PST format. For e.g.: now for 10 OST files, user can get 10 PST files if they choose to create individual PST file for each OST file. If they want all the data in one PST file, that is also possible. It will help you to merge multiple users data in one single file and import OST in Outlook.

mailbox folder and subfolder

Mailbox folder and Subfolder

The OST to PST converter shows mail folders and mail subfolders which allows you to choose exactly the files you want to transfer from OST to PST. You can avoid unnecessary data and eliminate the risk of making a mess.

ignore system folders hierarchy

Ignore System folders Hierarchy

This option is available for users in order to avoid conversion of system folders such as Inbox, Sent Items and pay attention to the folders created by users for their own needs when transferring files from OST to PST. This is especially useful if you want to have a simpler structure of the resulting PST.

change language

Change language

This feature allows you to change the names of the standard Outlook folders to the desired languages. The tool will change the titles of folders automatically according to the language chosen by you (English, Spanish, Dutch, Italian etc.).

Complete Data Conversion

What Data Can Be Converted With Our Professional OST to PST Converter Tool?

Complete Emails

Email Messages

OST emails can be transferred to PST without any issue maintaining all the details like body content, addresses of origin and destination, formatting, embedded links, and attachments. This tool ensures that the email properties will remain unchanged.

Attachments

The software makes it possible to transfer any attachments from the OST files to the PST system. The software allows working with several file types, including:

  • Documents: PDF, DOC, HTML, XPS, CSV
  • Images: PNG, JPG, JPEG, BMP, GIF, TIFF
  • Business Cards: vCard/VCF (All Versions)
  • Calendars: ICS Files
Email Metadata

The tool saves different essential data such as:

  • Sender, recipient, CC, and BCC addresses
  • Subject and time of sending
  • All original email headers for correct tracking
Folder Structure

The tool saves all information from the original mailbox structure. Different folders and also more complicated mailboxes remain unaffected by the process.

Calendars

Calendar and Attachments

The tool saves all information from the original mailbox structure. Different folders and also more complicated postal mailways remain unaffected by the process.

  • Tasks
  • Meetings
  • Group Schedules
  • Appointments and Events

Contacts

  • Name and Nicknames
  • Personal and Business Phone Numbers
  • Email Addresses and Physical Addresses
  • Birthdays and Other Saved Notes

Tasks

  • Subject/Title
  • Start Date and Due Date
  • Status
  • Priority
  • Completion
  • Reminder
  • Recurrence
  • Body/Notes
  • Attachments
  • Owner and Delegation

Journals

  • Subject/Title
  • Entry Type
  • Start Time and Duration
  • Contacts
  • Company
  • Categories
  • Body/Notes
  • Attachments
  • Icons/Indicators

Notes

  • Subject/Title
  • Body/Text
  • Color Category
  • Published and Modified Date
  • Size
  • Categories

Other Folders

  • Deleted Items
  • Drafts
  • Sent Items
  • Search Folders
  • Junk
  • Outbox
  • User-Created Folders

Differences Between OST and PST

Understanding the key distinctions between OST files and PST files
OST (Offline Storage Table) PST (Personal Storage Table)
  • Acts like a copy of your mailbox on your computer server.
  • Connected to your Exchange, IMAP, or Microsoft 365 account.
  • Connected to one specific Outlook profile.
  • Not easy to access from another computer.
  • Created automatically when you create your Outlook account.
  • Used for saving, archiving or backing up your emails or other data in Outlook.
  • Independent of a mail server.
  • Easy to transfer everywhere.
  • Can be opened on another computer and imported to Outlook.
  • Created manually or by exporting data from Outlook.

Trusted Download Platforms

OST to PST Software is Available on Multiple Verified Platforms

uptodown

UptoDown

According to UptoDown Editors, BitRecover Converter OST to PST is a reliable tool to batch convert OST to PST with preserving emails, contacts, calendar and other data

cnet

CNET

According to CNET editors, this tool is marked as top 5 best OST to PST tool for its ability to accurately convert OST files to PST including all components such as emails, contacts, calendars, notes, and more.

topsoftware advisor

TopSoftware Advisor

TopSoftware Advisor lists BitRecover OST to PST Wizard as a highly recommended software for Export OST to PST, specially known for accurate and simple GUI.

updatestar

Updatestar

Updatestar highlights BitRecover OST to PST Converter is safe to download and offers faster performance with your maintained PST file as appears in the source OST file.

saashub

Saashub

Featured on Saashub, BitRecover tool to convert OST file to PST is trusted and verified by technical experts and also offers modern features.

download.io

Download.io

According to Download.io, this tool provides fast, reliable and complete OST to PST Conversion, preserving all email elements and offering a smooth user experience.

System Specifications

Minimum System Requirements Needed to Run OST to PST Wizard

Software Download

File Size : 48 MB

Version : 26.2

Trial Limitations

Get the free version of the tool to quickly check its features. By using the demo edition, you will be able to convert OST to PST files, but you will be limited to saving only 25 items from each folder. To be able to convert OST to PST files without limitations, you will need to buy the regular version of the application.

System Specifications

Hard Disk Space
200 MB of free hard disk space

RAM
Minimum 4 GB RAM

Processor
Intel® Pentium 2.4 GHz processor

Supported Platforms

  • Microsoft Windows – Windows 11 (64-bit), 10, 8, 7 (32-bit and 64-bit), and Windows Server 2025, 2022, 2019, 2016, 2012 R2, and 2008.
  • macOS – Golden Gate (Beta), Tahoe, Sequoia, Sonoma, Ventura, Monterey, Big Sur, Catalina, Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks, and Mountain Lion, etc.
  • Supported Source – Outlook ANSI and Unicode OST files.

Product Guides

Software Guide

Installation

Uninstallation

EULA

Electronic Delivery

The BitRecover OST to PST Wizard will be delivered automatically after your payment is received and confirmed. You will receive an email with a link to download the product and the activation key.

Feature Comparison

Compare Trial vs Pro Versions of OST to PST Converter to Choose the Right One
  •  
  • Load OST File Automatically
  • Browse Selective OST File
  • Apply Naming Convention
  • Preserved Original Folder Hierarchy
  • Compatible With Windows 11 & Below Versions
  • Convert OST to PST without Exchange
  • Total Conversion
  • Cost
  • Trial Version
  • 25 items/folder
  • 25 items/folder (emails, contacts, calendar entries, etc.)
  • $0
  • Download
  • Most Popular
    OST to PST Converter Full Version
  • Unlimited
  • Unlimited
  • $39
  • Buy

Client Feedback

Hear From Users Who Successfully Converted Their OST files to PST Using Our Tool

Write a Review ❯ Read More Reviews ❯

Common FAQs

Mostly Asked Questions About Converting OST files to PST Using BitRecover Wizard

Follow the steps to bulk convert OST to PST file for Windows & Mac OS.

  1. Download the OST to PST Wizard and install it.
  2. Launch the tool and add the OST file to its interface.
  3. Simply click on the Next button to start the OST to PST conversion.
  4. Finally, you have a PST file with the same data as in the OST file.

Yes, the BitRecover tool for OST to PST supports orphaned OST files for PST conversion. Using this software, you may easily export orphaned OST files into PST format even when the source email account is no longer accessible.

No, OST and PST files are not the same. OST stands for (Offline Storage Table), which is primarily used by Outlook to store a synchronized version of Outlook.com, Office 365, Exchange, and IMAP accounts for offline use. Whenever you connect to the internet, the OST file get sync again for the updated information.

PST stands for (Personal Storage Table), which is a local Outlook data file primarily used for backup, archiving, and data portability. The PST file contains emails, contacts, calendars, tasks, journals, etc without depending on an active email account or IMAP server connection.

The main limitation of the OST file in Outlook is that it is directly connected to the mail server. Therefore, it cannot be accessed independently, which is more often when OST files get orphaned. Another limitation is its default size limitation, which is 50 GB for new versions of Outlook. When the OST file reaches its limit causes a performance issue and sometimes email sends or receives errors.

Yes, BitRecover OST to PST converter is a free tool to convert 25 items from each OST folder to PST format. However, if you are an IT admin, organization, or enterprise, then for unlimited conversion, you need to upgrade the version of the BitRecover wizard for bulk and unlimited OST to PST conversion.

No, the BitRecover tool for converting OST files to PST is a standalone program that can run independently without requiring any internet connectivity.

You cannot directly import OST files into PST format. For an easy and accurate conversion, you always require a specialized tool like BitRecover OST to PST Wizard.

No, you cannot directly access old OST file in Outlook since it is an encrypted and profile-bound file that is directly connected to the server. However, you can access the data by turning OST files into PST using specialized BitRecover OST2PST wizard.

If your Outlook profile is corrupted, having synchronization issues, oversized OST files, or permission problems, then Outlook does not allow you to open the OST file. To restore the normal functionality, you need to remove the existing profile and recreate the Outlook profile. Remember to convert your OST file into PST for data integrity reasons.

If an email account gets deleted from the server, then the email account OST file gets orphaned and cannot be directly accessible in Outlook. Therefore, to retrieve the OST file data and convert into PST when the account is deleted, you must use an accurate OST to PST software for the best results.

Yes, you can convert OST files to PST even when the Exchange account is deleted or disabled from the server. But remember, it is necessary to have the OST file available on the system for PST conversion.

After converting OST files to PST user should perform several data integrity check like email count, folder hierarchy preservation, contacts, calendars, etc. However, the BitRecover OST to PST software automatically creates a saving.txt and errors.txt log report to ensure reliable and accurate conversion.


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