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SysTools OST to MBOX Converter
Tool to Export Inaccessible OST File Emails into MBOX

(Average Rating 4.5 Based on 157 Reviews)
  • 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 all MS Outlook Versions
    The software supports OST files generated by all the listed versions of Outlook for the conversion to MBOX (Outlook 2013, Outlook 2011, Outlook 2010, Outlook 2007, Outlook 2003, Outlook 2002, Outlook 2000, etc.)
  • Supports both ANSI and Unicode OST files

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

List of Features that SysTools OST to MBOX Software Exhibits

convert ost to mbox

Convert OST to MBOX

The OST Data to Mailbox 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

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.

Outlook OST to Thunderbird

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 Import Software, which can be obtained free of cost along with OST data to MBOX Converter.

save file in new folder

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.

import and open file

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.

Import OST to Apple Mail

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.

Outlook OST to MBOX Migrator Tool Screenshots
Know How to Migrate Outlook Email OST File to MBOX through Outlook to MBOX Migration Tool

Outlook OST data file to MBOX
Step 1:Open Outlook OST Data to MBOX Converter
scan ost file
Step 2: Scan Outlook Email OST File
preview outlook ost data
Step 3: Preview OST File Items
convert OST to MBOX
Step 4: Export Outlook OST file to MBOX
Watch Live Video of OST to MBOX Converter
Video describing the method to Export Outlook OST File to MBOX

Download Outlook OST to MBOX Exporter Software
OST to Thunderbird MBOX Converter

Size: 3.3 MB Version: 1.0

Trial Limitations

Demo version of OST to MBOX Converter software allows the preview of inaccessible OST FIles.

Download Outlook OST to MBOX Converter

Installation Uninstallation EULA

System Specifications

System Specifications
  • Hard Disk Space: 5 MB of free hard disk space

Application Pre-Requisites

  • If you are using Window 8.1/8/7 or Vista, then please launch the tool as "Run as Administrator".

Supported Editions

  • Microsoft Windows – 2000, 2003, 2008, XP, Vista, or Windows 7/8/8.1/10, 2008/2012 (32-bit & 64-bit)
Frequently Asked Questions

What all are the main qualities of SysTools Outlook to MBOX Converter that makes it dominating over other tools?

I want to use the tool to access my inaccessible OST to Thunderbird MBOX on my new Windows 10 machine. Can I?

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.

How to import Outlook OST File selectively to Eudora mail MBOX Files?

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.

What is the file size limitation imposed by this tool?

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.

Will the software allows the email meta properties to be kept intact even after the conversion?

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

Can I import OST to Apple Mail MBOX?

I have bulk OST data with me. And I wish to import the OST to Mac Mail account of mine. Is it possible?

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

Is it necessary to have any MBOX supportive email client on my machine to convert OST email file to MBOX?

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.

Is the resultant MBOX files created after the Conversion, compatible with Entourage account?

"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.

How much time is required to move Outlook 2013 OST data file to Opera Mail?

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.

Will the tool convert .ost formed as a reult of configuring Hotmail in MS Outlook?

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

Is it possible to convert inaccessible OST files using this software?

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.

Get an Overview of Outlook OST Data to MBOX Software Features - DEMO and Licensed Version

Features DEMO Version FULL Version
Add Outlook OST File
Quick Scan OST File
Preview Items with Property
Restore all OST file items
Windows 8 & All Other Previous Windows Version Supported
Save Selective Folder as MBOX
Save File in New Folder
Cost FREE $49
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Full Version



Outlook OST to MBOX






OFFER Valid Till 31st Aug

Outlook OST to MBOX + OST Recovery




$98   $69

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Note: The final price of software may be subject to sales tax depending upon your residence. The "Estimated Sales Tax" is displayed at the time of Check Out when you confirm the order.

Software will get delivered on your registered email id, within few minutes after placing the order.

Electronic Delivery: The delivery of product is automated. You will receive an email containing both the link to download the product and the activation key within few minutes after payment confirmation.

Purchase Order: You can place the order via Purchase Order(PO) Click Here

amazon        CR        NSIC         CIO       BBB
License Information Personal License Business License Enterprise License
File Limitation Convert Unlimited Outlook OST file into MBOX Convert Unlimited Outlook OST file into MBOX Convert Unlimited Outlook OST file into MBOX
Bulk Conversion Support
24x7 Technical Support Unlimited Unlimited Unlimited
Free Product Updates
30 Day Money Back Yes, Money is refundable Yes, Money is refundable Yes, Money is refundable

Features in Demoware & Commercial License

An Overview Of The Contrast between Trial & Purchase License

Outlook OST to MBOX Converter FREE Version FULL Version Bundle Offer
Add OST File
Recover Corrupt OST File
Preview OST File Data
Export OST to MBOX
OST Recovery
Repair Corrupt OST File
Preview OST data with items
Two Different Scanning Mode
Export Selected items from OST File

Frequently Asked Questions

Listed Commonly Asked Questions and Answers

What Clients Say

I searched and found SysTools Outlook OST to Thunderbird Converter for converting my OST Data file to MBOX format. I am so grateful to the entire team of SysTools for providing an application that takes care of the process that falls after license upgrade, which no one else does.

Santana Craig, US

Though the interface of Outlook OST data to MBOX migrator was quite friendly and didn't involve any complicating steps, at some point when I got stuck, contacting support team proved helpful. Hats off to the executive who patiently helped me out at each step without any delays. Thankful to the SysTools Group team.

Coleman Fischer, Germany

I have been searching for an efficient tool to convert my OST file to Thunderbird MBOX format. As per my colleague's suggestions, I used SysTools Outlook to MBOX Converter. The results were awesome. Kudos SysTools!

Matthew Perry, Central Park

I was really worried when I faced a sudden need to convert the complete OST data to MBOX format. I found OST to Mac Mail Converter from Google. Eventhough I was worried about the credibility of the tool, I used it and found surprising results. I am willing to suggest it to all without any hesitation.

Mila Kudrow, Columbia

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