SysTools OST to MBOX Converter

Tool to Export Inaccessible OST Files into MBOX Fromat

(Average Rating 4.5 Based on 1252 Reviews)


Outlook OST to MBOX











SysTools Outlook OST to MBOX Converter Software

  • Convert OST Files into MBOX PST, MSG, EML, EMLX, NSF
  • Export into Document Formats PDF, vCard, CSV, ICS, TXT, HTML, MHT, DOCX, DOC, RTF
  • Convert multiple emails along with attachments from Outlook OST into MBOX
  • Scan & Preview emails from healthy, corrupted and inaccessible OST files
  • No Size Limitation: Convert OST files of any size to MBOX
  • Converts OST files to MBOX without considering it's mode of formation.
  • No Exchange server environment needed to migrate emails
  • Convert OST files created by Outlook 2021, 2019, 2016, 2013, 2010, etc.
  • Supports both ANSI and Unicode OST Files to MBOX Conversion

Free Live Demo - SysTools Outlook OST to MBOX Converter Fully Secured Download Version


Check the Capabilities of SysTools Software to Convert OST to MBOX Format

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OST to MBOX Converter Software - Features

Understand The Features of Software and Convert OST to MBOX Format Easily

OST to Mbox Convert

Convert OST to MBOX Format

The OST Data to MBOX Converter software helps you to convert multiple emails from the entire folders of an OST file into MBOX format keeping attachments embedded in mails. It is possible to convert emails from inbox, outbox, drafts, sent items, etc. into the MBOX file format by retaining complete Meta data. Also, the software will maintain the folder hierarchy while saving OST as MBOX.

scan OST file

Scan OST File

As you open the OST file, the software will perform it's quick scanning. This will help users to reindex the data from a corrupt, inaccessible or orphan OST file. All the items and folders present within the OST file will get scanned and listed in its original folder structure. The scanned result will get automatically saved and to open or scan another file you will need to close the previous one.


Preview Items with Property

Once the scanning finishes, the software will generate the instant preview of all the emails present within the OST file. It is possible to view all the details associated with each items like: To & from email address, subject of mail, date, contact name, fax number, contact number etc. The software ensures to keep these Meta properties intact after Outlook Email OST file to MBOX conversion.

save selective folder

Save Selective Folder as MBOX

By default, the Outlook OST data file to MBOX converter allows you to migrate all the item folders from OST into MBOX. But, if required, you can check or uncheck the items to save only selective item folder. The software will create an MBOX file for each item folder having emails e.g. inbox.mbox, sent-items.mbox, drafts.mbox and so on.

migrate ost to mbox

Migrate Outlook OST to Thunderbird

Since Mozilla Thunderbird is a globally used MBOX supporting email client, many users will be having the need to convert OST to Thunderbird format. This tool allows the users to import OST file to Thunderbird MBOX format easily and efficiently.

Note: Export the resultant MBOX files to Thunderbird using Thunderbird ImportExportTools add-on, which can be obtained free of cost.

simple and easy to use

Save File in New Folder

As you click on the button to export OST files to MBOX, the software will ask you to provide a file saving location on your machine. You can select any desirable location or if required you can create a new folder from software panel itself to save the file. Once you provide the saving location, the software will begin the conversion.

no installation required

Import OST Emails to Multiple Email Clients

MBOX files are being used by a number of emailing applications like Eudora, Entourage, Apple Mail, Mac Mail, Sea monkey etc. Each of these applications allows you to import MBOX files from an external source. Thus, once you export OST email file to MBOX, it will become easier for you to open an inaccessible or orphan OST file data.

simple and easy to use

Import OST to Apple Mail

For Mac users, it is easier for them to use Apple Mail for accessing the MBOX files than using any other email clients. OST to MBOX Converter can convert OST files to Apple Mail MBOX format without data loss.

OST to MBOX Converter - Specification

Download Free Demo Version and Understand Software Working

Software Download

Trial Limitations

Free Demo version of the software will generate Preview of OST mailbox data & Support to Convert only 25 Items per Folder from OST file to MBOX, PST, MSG, EML, EMLX, NSF, PDF, vCard, CSV, ICS, TXT, HTML, MHT, DOCX, DOC, RTF format.

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


Hard Disk Space
100 MB of free hard disk space required

4 GB is recommended

Mac Computer with Intel Processor
Mac Computer with Apple Silicon (Apple M1)

Supported Platforms


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

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


MacOS X 10.8 (Mountain Lion), MacOS X 10.9(Mavericks), MacOS X 10.10 (Yosemite), MacOS X 10.11 (El Capitan), MacOS X 10.12 (Sierra), MacOS X 10.13 (High Sierra), MacOS X 10.14 (Mojave), MacOS X 10.15 (Catalina), MacOS X 11.0 (Big Sur), MacOS X 12.0 (Monterey), MacOS X 13.0 (Ventura), MacOS X 14.0 (Sonoma)

Application Pre-Requisites


  • Microsoft .NET framework 4.5 or above should be installed.


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OST to MBOX Converter – Comparison

Get an Overview of OST Files to MBOX Converter - Free DEMO and Full Version

Features Demo Version Full Version
Add Outlook OST File
Quick & Advanced Two Scanning Mode
Preview Items with Property
Remove S/MIME & OpenPGP Encryption
Windows 10 & All Other Previous Windows Version Supported
Export Selective Folder from OST to MBOX 25 Items/Folder
Export Complete Data from OST to MBOX 25 Items/Folder
Also Export in PDF, vCard, CSV, ICS, TXT, HTML, MHT, DOCX, DOC, RTF, PST, MSG, EML, EMLX, NSF 25 Items/Folder
Cost FREE $49
Frequently Asked Question
How Can I Convert OST to MBOX Format Using This Tool?

“I got a number of suggestions on Google for Outlook email OST file to MBOX converter. Share some features of your software so that I can choose yours among them.”

4 Steps to Convert OST to MBOX File Format:

  • Step 1: - Download & Install OST to MBOX Converter
  • Step 2: - Add OST files and Preview Complete Data
  • Step 3: - Apply Advance Setting (If Required)
  • Step 4: - Select MBOX Radio Button and click on Export

Yes, you can use the tool on Windows 10 machine. You can install the tool on any Windows machine version 10 or below & recover all OST file items into MBOX format.

You can move Outlook OST Data file selectively to MBOX using OST to Eudora Mail converter by checking or unchecking the items that you wish to import to the MBOX format.

Inorder to import OST to Thunderbird MBOX, the tool doesnot impose any file size limitation. You can undoubtedly convert your large sized OST data to MBOX file format.

Yes, During OST file to Thunderbird migration, the Outlook email OST file metadata is being kept intact for the easiness of the user.

“I got a number of suggestions on Google for Outlook email OST file to MBOX converter. Share some features of your software so that I can choose your's among them.”

Yes, It is possible to import the resultant MBOX files generated as a result of the conversion to your Apple mail account without much difficulty

No, there is no need to have any MBOX supportive email clients such as Thunderbird, Eudora, Entourage or Poco Mail on the machine. Software will convert outlook OST to MBOX seamlessly.

I have both Outlook and Entourage account. Now a days I am facing trouble accessing the OST files. I suspect it is because of OST file corruption. Is there any way to convert the OST files to my Entourage account without data loss.

Yes, you can use this tool to migrate Outlook OST data to Entourage account. Since Entourage is one among the large number of email clients which supports MBOX files, there wont occur any compatibility issue also.

I am having OST data of around 3GB with me. As I wish to start using an MBOX supporting Email client now, I need to convert it to MBOX format. Will it take too much time for converting into MBOX?

No, it wont consume much time to convert the OST data files to MBOX since completion time depends only on the size of the OST file. Since you are having only 3 GB of data, it wont take much time as you think for the conversion to complete.

I am having Hotmail account which is configured with the Microsoft Outlook. I need to convert the resultant OST files to MBOX format. Can I do it using this Software?

Yes, you can covert the OST files from Hotmail Configuration without considering it's mode of formation. Because this tool can convert OST files which are formed as a result of the following processes:
  • Configuring Exchange Server with MS Outlook
  • Configuring Hotmail account in Outlook
  • Configuring Office 365 account with Microsoft Outlook
  • Configuring any IMAP account in MS Outlook

Yes, It is possible to convert healthy, corrupted as well as unusable (also called as inaccessible or orphan) OST files using the OST to Mailbox Converter.

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