OST Converter

OST File Converter for Mac & Windows OS to Export OST to File Formats/Cloud Accounts — PST, PDF, EML, MSG, MBOX, Zimbra, Lotus Notes & to Cloud Accounts — Office 365, G Suite, Gmail, IMAP, AWS

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Why CubexSoft OST Converter?


Export every element of the inbox, including emails, attachments, contacts, calendars, and notes, with 100% accuracy. IT administrators and Microsoft MVPs have confidence in CubexSoft OST Converter.


Works Offline

CubexSoft OST Export Tool is the perfect offline solution. You can simply install and run this tool on any Windows OS and Mac to export Offline Outlook OST file to PST, PDF, MBOX, EML, MSG, CSV, etc. It works even without an internet connection so it is much safer than an online OST Converter.


Export Huge Sized OST

The tool export OST files without any file size limitation. The software cleared all the test of transferring large sized sample OST files i.e. up to 1 TB to multiple file formats. The feature is very important for corporate sector user which have huge sized database to transfer.


Independent Application

OST converter is a solitary tool which does not require configuration of MS Outlook or Exchange Server in your system to perform the conversion process. It is completely independent application which doesn't require any other application to depend upon. The tool only need OST files to transfer them in multiple file format.

OST Converter





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Features for Best OST Converter For Mac & Windows

CubexSoft OST Converter for Mac & Windows software enables high-performance moving of Offline OST files into different file formats like PST, PDF, MBOX, EML, MSG, DOC, DOCX, TXT, RTF, XPS, etc. without opening Outlook. If a user wants to move OST data on cloud, then it is possible now with OST Converter. By using the application, a user is free to export OST mailboxes to Exchange, Gmail, G Suite, Office 365, AWS, IMAP Server, IBM Verse, Yahoo and more. It supports both Windows and Mac operating systems and runs perfectly on all previous and current versions of Windows OS and Mac.

  • Extract mails from OST file to PST, PDF, EML, EMLX, MBOX, HTML, etc.
  • Easily batch convert unlimited OST files to another account/format at once.
  • Capable to move OST files into multiple email clients – Thunderbird, Windows Live Mail, Zimbra, etc..
  • Allows instant OST backup to various cloud applications – Gmail, Office 365, Gmail, etc.
  • Quick OST contact migration from Outlook to vCard/VCF and CSV.
  • Precise export OST calendar to ICS (iCal) with complete details.
  • Supports multiple languages and email file text formats
  • Includes Add File and Add Folder buttons to add OST file on the software
  • Provide checkboxes with loaded data items of OST for selective migration.
  • OST Export performs accurate OST export process with large-sized OST files
  • Maintains formatting and folder structure of OST Files
  • Ability to backup corrupted OST file with 100% success rate.
  • Supports OST file of entire Outlook Exchange editions
  • MS Outlook installation is not needed to perform OST File Conversion
  • Easy to install and run on any version of Windows OS & Mac OS

What's More to Expect from CubexSoft OST File Converter?


Supports Direct OST Conversion to Cloud Apps

OST File Converter for Mac OS & Windows OS is updated with more enhanced functionality. Now, a user can backup OST mailbox database to number of cloud accounts such as Exchange Online/Office 365, G Suite, AWS, Gmail, IMAP, Yahoo and many more

The new version of software supports direct OST backup to cloud-supported applications -

  • Office 365
  • Exchange Server
  • Gmail
  • Amazon Workmail
  • Rediffmail
  • IMAP Servers
  • Hosted Exchange Server
  • G Suite
  • Yahoo
  • IBM Verse

directly convert OST file

Handles Large-Sized OST File Easily

The All-New version v2.0 CubexSoft OST Export is capable to handle large OST files to desired email text format/account in a single click. The process sometimes failed in the previous version. But, now the tool is tested and launched after checking its file size efficiency..

With this OST Export, now a user can move OST file of any size to any file format or account without hesitation in few seconds. The OST File Converter has user friendly and attractive graphical interface. It elaborate the working of the software in the very starting which makes user to understand the working steps in brief. It is designed in such a way that it can be easily operated by any user irrespective of their background (technical or non-technical).

convert a large size ost files

Multiple Options to Load OST Folders from Mac & Windows System

The updated version of OST Export now offers multiple options to load OST files. A user can make use of Add File option to load few required OST files for conversion. Add Folder allows to add entire OST file folder for conversion. Moreover, Load Outlook Profile option facilitates to load the OST folders directly from Outlook Profile.

OST file converter

Essential Features of OST Export
Expertise Recommended - OST File Converter to Export Multiple OST Mailboxes into Cloud/Hard Drive on Mac OS & Windows OS


ost file converter

Export unlimited OST Files in Batch

OST Converter utility is designed to convert unlimited OST files at once. The software provides option for selecting multiple OST files and converting all of them to the desired format, in single cycle. The option is beneficial for users as it helps them in saving their precious time and efforts.

ost converter

Move Outlook OST to Multiple Mail Text formats

With Mac OST Conversion Tool, users can now convert and access their OST files in multiple formats. The software, very precisely extract data from Outlook .ost file to PST, PDF, OLM, EML, MBOX, EMLX, MSG, DOC, HTML and RTF. Moreover, there is no need to worry about the accuracy of the data as the software keeps all the Meta headers, formatting and all other details retained in perfect manner.

ost converter

Complete conversion of all Exchange items

An OST file consists of complete Exchange data which includes emails, contacts, calendars, notes, tasks, journals etc. The OST File Converter provides assured migration of entire Exchange items contained within OST files, without any data loss or alteration. Moreover, the tool supports migration of OST contacts and calendars to their standard formats, i.e, vCard/CSV and ICS respectively.

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Direct OST Migration to Multiple Accounts

OST Converter is an advance migration utility. With unlimited saving formats, the tool also provide functionality to migrate OST directly into email accounts such as Thunderbird, Lotus Notes, Zimbra, Maildir and Windows Live Mail.

ost converter

No need for Outlook installation

The Mac OST Migration is fully capable to work efficiently without even installation of Outlook and any other application. It's a completely independent utility and is not relied upon any other app installation.

mac ost file converter

Split output file for better management

OST Export software provides splitting option to break the output files into specified file size in MB or GB. Splitting option makes data more manageable for users, and thus is a very useful feature provided by the software.

ost converter for mac

Save data with different file naming options

With OST Converter, users also get the benefits of saving their resultant files with multiple file naming conventions. With this option, one can save output file according to the pre-defined options – Subject, Subject + Date (DD/MM/YYYY), Date (MM/DD/YYYY) + Subject + From etc.

ost converter

Option to Ignore System Folder

An OST file consists of System folders (both IPM subtree and Non-IPM subtree) and User folders (Inbox, Outbox, Sent Items, calendars, contacts, deleted items etc. Many users want to save only user folders data and OST Converter provides them with the option to ignore system folder while migrating OST files to supported formats.

ost converter

Convert Selective OST Folders

The OST File Converter enable users to convert selective OST folders/files to multiple file formats with both Mac OS & Windows OS. For instance you load your entire OST mailbox in the software but you want to convert only Inbox folder then you can choose only Inbox folder and move forward. The tool eliminate unnecessary conversion of OST files by allowing user to choose desirable folder/file for conversion process.

ost file converter

Retains Read/Unread status of emails

Keeping the read/unread status of emails intact is foremost priority of users while viewing their data in some application. And the OST Converter is designed is such a way that it helps them get the read/unread status of all the message retained in as is manner.

ost converter mac

Widely compatible software

The OST Migration is widely compatible with all Windows and Outlook editions. Use the application on all Windows (32bit and 6bit) editions – 11, 10, 8.1, 8, 7 etc. Moreover, users can move an offline Outlook data file (.ost) 2016, 2013, 2010 and all below editions into different applications supported file formats.

ost export

Maintains all Email Attributes

The OST Converter for Mac is capable of maintaining all email attributes and properties of OST files. It convert OST file to multiple file formats in accurate email formatting such as cc, bcc, date, time, hyperlinks, header, signature, subject, email folder, calendar, contact, tasks, junk, notes, deleted item, text formatting, inline image etc.

Software Prerequisites & Recommendations

                 ost converter

Trial Limitations - Download FREE demo edition of OST Converter to know how to extract emails from ost file free. Evaluation copy of the software allows to extract email from ost free, but with the limitation of first 25 items from OST file to supported formats.


System Requirements


Intel® Pentium 1 GHz processor(x86,x64) or equivalent


Minimum 512 MB is required

Hard Disk Space

50 MB of free hard disk space

Trial Limitations

Convert first 25 OST files for free.

Supported Editions

Windows OS

Windows 11, 10, 8.1, 8, 7, Vista, XP

Mac OS

Monterey, Big Sur, Catalina, Mojave, High Sierra, Sierra, El Capitan, Yosemite

Electronic Delivery

The product will automatically delivered. Once the payment is received, you will get an email with the activation link that will contain the key to upgrade the license.

  Eula   Software Guide  Install/Uninstall

Comparison of Trial & Full Version

Feature Comparison of OST Export Software - DEMO and Licensed Version

Features DEMO Version FULL Version
Convert OST Data Files
Dual Modes to Load OST Files
Allows Conversion of OST Files First 25 items per folder All Items
Browse choice destination path
Multiple saving options
Maintains original data integrity
Supports Both Windows & Mac OS
Live progress report
24*7 Tech Support & Secure 100%
Cost FREE $49

Frequently Asked Questions

Common Queries Related to CubexSoft OST Converter Tool


I want to move OST files directly to Office 365. So, if possible can you guide me the steps in brief?

Step 1. Install and Run OST Export Software on any Windows OS.

Step 2. Use Add Files or Add Folder or Load Outlook Profile folder button to load OST file

Step 3. Software start scanning OST file and when it gets finished, a complete data items will appear with checkboxes. You can select them as per need for selective OST conversion.

Step 4. Now, go to drop-down arrow of Saving Options and choose Office 365 from the saving list. Enter the login details in which you want to move OST data. Also, it is recommended to use I am Admin account if you want to backup all user accounts in a single processing.

Step 5. Click on Convert button to start the conversion process.

>No, the software will not delete or make any alterations to the integrity of your OST files. The software only extracts data and maintains that each and every data item along with other OST properties their folder structure are kept in original form, as they were before conversion.

Absolutely yes, you can easily convert all your .bak files into your desired application without any problems. Just rename your .bak file with the extension .ost and this OST Converter will successfully recognize and convert entire data from this OST to the supported format.

The software is capable of converting entire mailbox items from Exchange offline OST files, which includes emails, contacts, calendars, tasks, notes, journals etc.

Absolutely yes, OST Export Tool is capable of converting orphan, offline and inaccessible OST files with complete efficiency. Basically orphan OST files are created in situations when they are not available in their original Exchange environment. Once they are disconnected with their Exchange server, these files become more vulnerable to corruption, mainly due to hardware/software failures. Offline OST file, on the other hand, gets created when the option "Cache Exchange Mode" is enabled in Outlook. Don't worry, the software is designed to convert all types of Offline, orphan, corrupt and inaccessible Outlook OST files to supported formats.

Absolutely yes, the software doesn't need a user to be connected with Exchange server for converting OST files.

Absolutely yes, OST Converter is capable of converting large number heavy sized OST files on any system Mac OS & Windows OS without any problems and interruption.

You can download FREE trial edition of the OST Export software and get it evaluated before purchasing the licensed edition. With FREE demo edition, you are allowed to convert first 25 items from OST files to your desired output option.

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