OST to PST Converter

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For Mac





SysTools OST to PST Converter

(Average Rating 4.7 Based on 2736 Reviews)

Export inaccessible, orphaned, offline, and corrupted OST to PST format. Individuals as well as organizations can re-access their mailbox data in MS Outlook even the Exchange Server is crashed, or the mailbox is dismounted. SysTools OST to PST converter has been selected by Microsoft MVPs as one of the best choices to convert OST to PST format.

  • Convert OST to PST with Emails, Calendars, Contacts, Task, Journals, & Notes
  • Convert OST Files into PST, MBOX, MSG, EML, EMLX, NSF File Format
  • Export into Document Format: PDF, TXT, HTML, CSV, MHT, DOCX, DOC, RTF
  • Capable to Export Contacts into vCard and Calendars in ICS Format
  • Capable to Export Selective Items from Any Folder and Category
  • Allows to Convert Multiple OST Files into PST Format At Once
  • Save and Load Scan for Faster Re-scanning of Large OST Files
  • Convert Your IMAP, Office 365, Exchange, Hotmail & Outlook.com OST Files to PST
  • Allows to Convert Hosted Exchange and Online Exchange OST Files to PST
  • Decrypt & Remove S/MIME & OpenPGP Encryption from Outlook OST Emails
  • Easily Convert OST to PST Without Exchange Profile or Server Connectivity
  • Download OST to PST Converter and Install It on All Windows and Mac OS Versions
  • Free Live Demo - SysTools OST to PST Converter Fully Secured Download Version
  • Safe & Secure; Total Safety Score: 100%

OST to PST Converter - Awards and Reviews

Expert Reviews and Rating of SysTools Software to Bulk Convert OST Files to PST Format

MVP Reviews

Expert Reviews

OST to PST Converter - Highlighted Features

Download and Install The Software to Verify The Stated Features During Conversion

software screen

Search OST File from Your Computer

With this remarkable feature, users can efficiently add bulk OST files for conversion. Within the software panel, it facilitates an option to Search File automatically, which is followed by Search Selected Drive and Search All Drive.

Using Search Selected Drive, one can easily locate OST files from different drives such as C, D, E. Whereas, using “Search All Drive” option, the software will locate the OST files from all drives within a single click.

Based on the OST file corruption level, one can choose the desired scan mode options i.e., Quick and Advanced. The Quick Scan mode is for minor level of corruption. And the user can choose advanced Scan mode convert majorly corrupted OST to PST format.

Download Wizard

Convert OST to PST With Advance Options

While converting OST to PST format, numerous advanced export options are rendered by the tool. This includes the following options:

  • Maintain Folder Hierarchy: Preserve folder structure of the resultant PST file, same as per source format. User can check this option to preserve folder hierarchy or the user can uncheck this option to get flat hierarchy.
  • Don’t Export Empty Folder: SysTools OST to PST converter allows users to discards empty folders getting converted to the output PST file.
  • Use Outlook: To speed up the conversion process the user requires MS Outlook needs to be installed & configured with an account.
  • Ignore System Folders: Selecting this option will ensure that system folders will not be converted from OST to PST file.

software screen

Know When to Use SysTools Converter for OST to PST

Microsoft Outlook itself has export and archive features that let you save OST files from Exchange and IMAP servers in PST format. However, it fall short in some areas. Let's explore:

  • IMAP Server Not in Use
  • Exchange Profile Deleted or Server Down
  • Having an OST File from Another User
  • Convert OST to PST without Outlook
  • Want to Migrate on Other Email Platform
  • Export Inaccessible, Corrupted, Offline OST to PST

OST to PST Converter Software - Features

Here Comes a Plethora of Highlighted Features Of This Converter for OST to PST

convert mailbox

Convert All Type OST to PST Format

Using this remarkable Outlook OST File to PST converter tool, one can seamlessly convert corrupt, IMAP, Office 365 and Exchange OST file without any hassle. With this utility, it is no more a complicated task to implement OST file conversion. All because of its user-friendly interface that allows even users having less technical expertise to convert offline OST files.

Scan Modes

Normal and Advance Scan Option

The SysTools software is developed with an advanced algorithm to convert OST file to PST format. The software renders 2 different scan options i.e., Quick Scan and Advance Scan. To restore data from minimal corrupted OST file, use Quick Scan. Whereas, the Advance Scan lets users to retrieve data from severely damaged OST file in an effortless way.

convert inaccessible file

Convert Inaccessible, Orphaned or Large OST

This Outlook OST to PST converter can convert inaccessible or orphaned OST file to PST format in bulk for Outlook 2019, 2016, 2013, 2010, 2007. It converts all data items stored in the multiple OST file such as emails, journals, notes, tasks, contacts, etc. By using OST to PST converter, one can convert offline Outlook file of any size successfully to PST. You can also save OST emails to PST in batch using this software.

preview data with metadata

Preview OST Data With Metadata

After successful completion of the scanning process, this convert OST to PST software provides an instant preview Offline OST items with 7+ Preview Modes: Normal Mail View, Hex, Properties, Message Header, MIME, HTML, RTF & Attachments. It includes a preview of all components in OST file like emails, contacts, journals, notes, calendars, etc. Moreover, users can view data in two different views: Horizontal and Vertical view . Also, recovered data is shown in Red Color & folders with data will be visible in bold.

convert multiple files

Convert Multiple OST Files to PST

This tool provide 2 checkbox option to enable users to include and convert single or Multiple OST Files at once :

  • Select File : Convert one OST file at a time to PST
  • Search File : Provides facility to auto search All or Selected Drive from User PC & bulk convert OST Files to PST at once.

full version

Auto-Search within Selected or All Drive

The Search File facility within software console gives two major functions which helps save users effort & time:

  • Search Selected Drive: Locate OST File from Selected Drive (eg- C:, D:, E: etc.)
  • Search All Drive: Locate OST File from All available drive in user PC

decrypt file

Remove S/MIME & OpenPGP Encryption

Decrypt Emails option in software console enable Users to easily Decrypt & Remove S/MIME (Secured Multi-purposeInternet Mail Extension) & OpenPGP (Pretty Good Privacy) encryption applied on OST File emails. After conversion, users will be able to receive output PST File without encryption which is accesible without Certificates & Private Keys password. Buy OST to PST converter full version and easily deal with encryoted OST.

bulk file conversion

Preserve Metadata After Conversion

With help of OST to PST software, one can convert all emails along with attachments stored in offline data file to Outlook PST format. It keeps the metadata of all items intact as the original. For eg: To, Cc, Subject, Size, etc. This converter preserves the original formatting of OST file items even after conversion.

buy ost to pst converter

Allows Numerous Advanced Filters

The Offline OST to PST converter offers various powerful filters to ease the OST file conversion process. The different filters include the option to “Split PST file” into small parts. Besides this, users can avail “Date Filter” option in which one can easily convert the desired OST data by specifying the date range. Using “Categories”, select and convert OST files to PST.

selected items

Selective Items / Folder Export Option

During the process of converting orphan OST files to PST format, one can convert selective OST files and folders. Within the software panel, users simply need to select the required files which are to be converted to PST format. Similarly folders like Inbox, Contacts, Calendars, Notes, Tasks, etc. can also be selected from the interface itself to convert it into PST format.

Advance options

Get Advanced Conversion Options

Applying various advanced filters to convert OST to PST, other advanced options are also utilized, such as: “Maintain Folder Hierarchy” which keeps the originality of the output PST file as per source format. “Don’t Export Empty Folder” option, all the empty folders will be excluded to get converted. “Ignore System Folders”, the system folders will be avoided getting converted to PST format.

Download tool

Supports Outlook 2021 & Below

This OST to PST Converter Tool provides Support to the latest Outlook Versions. After the successful conversion from .ost file user can export OST to PST in Microsoft Outlook 2021, 2019, 2016, 2013, 2010, 2007, 2003. Download OST to PST converter full version and install on your Windows system.

OST to PST Converter – Specifications

Use The Free Trial Version to Know How to Convert OST to PST Without Outlook

best offline software


Name: SysTools Converter for OST to PST
Version: 10.0
Size: 85 MB
Release Date: August, 2023
UI Languages: 20
MD5: 4210d66216102a3ba1efd525a0f6aec3
Free Version: Download Now


Name: SysTools OST to PST Converter for Mac
Version: 3.0
Size: 76.7 MB
Release Date: June, 2023
UI Languages: English
MD5: 4914247621351da78c96af747f95cfae
Free Version: Download Now

Trial Limitations:

Free demo version will generate preview of complete data & Export only 25 Items per Folder. To convert complete data, buy OST to PST converter full version. It is capable to convert OST to PST, PDF, vCard, CSV, ICS, TXT, HTML, MHT, DOCX, DOC, RTF, MBOX, MSG, EML, EMLX, and NSF format.

Free demo version will generate preview of complete data & Export only 25 Items per Folder. To convert complete data, buy OST to PST converter full version. It is capable to convert OST to PST, MBOX, MSG, EML, EMLX, PDF, VCF, CSV, HTML, MHT, ICS, TXT format.
(Windows) (Mac)
Hard Disk Space: 100 MB of free hard disk space required 100 MB of free hard disk space required
RAM: 4 GB of RAM (4 GB is recommended) 4 GB of RAM (4 GB is recommended)
Processor: Intel® Core™ 2 Duo CPU E4600 @ 2.40GHz 2.39GHz Mac Computer with Intel Processor
Mac Computer with Apple Silicon (Apple M1)


Windows 11 (64 bit), 10, 8, 7 (32 bit or 64 bit) & Windows Server 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:


  • If you are using Windows 11, 10, 8, 7 (32 bit or 64 bit) & Windows Server 2019, 2016, 2012 R2, 2008, then please launch the tool as "Run as Administrator".
  • Microsoft .NET framework 4.5 or above should be installed.



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OST to PST Converter Tool - Feature Comparision

Get an Overview of SysTools Software Features – Free and Full Version

Features Free Version Full Version
Add Single or Batch OST File
Two Scanning Mode (Quick & Advanced)
Auto Detects Corrupted OST Files
Allows Save Scan Report for Quick Loading
Launch OST to PST Converter in 20 Languages
Preview OST Emails with Attachment
Remove S/MIME & OpenPGP Email Encryption
Supports Windows 11, 10, 8, 7 (32 bit & 64 bit)
Convert OST to PST Format 25 Items/Folder All Items
Export OST to PST, MBOX, MSG, EML, EMLX, NSF 25 Items/Folder All Items
Export in PDF, vCard, CSV, ICS, TXT, HTML, MHT, DOCX, DOC, RTF 25 Items/Folder All Items
Cost FREE $49
Common Questions Asked by User

Most Common Queries Related to OST to PST Conversion Process

Question Answer
Q :

How to convert OST to PST using the software?

“I am using Microsoft Windows 10 on my official computer. I have 10 user’s account .ost files and I want to convert it into .pst file format. Please list the steps to convert OST files to PST format using SysTools software.”

SysTools converter for OST to PST is the best software to convert OST files to PST format in 5 Steps:
Follow instructions for quick conversion:
  • Step-1: Download SysTools OST to PST Converter and launch
  • Step-2: "Browse OST file" using Add File or Add Folder option
  • Step-3: Now "preview OST file data" into software preview panel
  • Step-4: Select "PST" radio button and browse path to Save output
  • Step-5: Hit "Export" button to start the conversion of OST to PST
Q :

Does It Support Converting Rackspace OST to PST?

Users of Rackspace Hosted Exchange can use this tool to convert OST to PST format even if they do not have active Rackspace environment.
Q :

What are the possibilities of accessing the contents of an orphaned offline mailbox?

"Most of the offline copy of my organizational user accounts are in an orphan state. The server is down for maintenance too. What can we do to regain the access to these replicas in the defined condition or is there a process to convert orphaned OST to PST?"

The Offline mailbox (OST) of users can be converted to Outlook PST format using this batch conversion for regaining the access of its contents for business continuity. The process to convert orphaned OST file into PST file format is very easy and simple.
Q :

What about the mailboxes storing more than 20 GB of data? How much time will it take to convert?

Although, the OST to PST conversion time depends somewhat depends on the amount of data being converted, but the software is capable enough to freely deal with large sized mailboxes too at the same time. Therefore, the size of mailboxes won't make much of a difference as the tool's rate of conversion from OST data file to PST is quite quick as compared to most other utilities of its category. Basically this application is capable to convert Large OST mailboxes easily.
Q :

How to re-import the OST file stored back to Exchange Server?

First thing OST is offline Outlook Data & it is not present on server. For reimporting the data on server you first need to convert .OST file to .PST file. Follow the given process:
  • First, select the desired mailbox & click on the icon and then Import PST.
  • Then specify the path to transfer PST file in Wizard & Click Next.
  • Then on second wizard select the user mailbox in which PST is need to import & Click Next.
  • On the final page select checkbox if you want to notify the PST has been imported & click on Finish.

That's all it become very easy to reimport the OST file back to the server if you have converted already in PST. And for risk free conversion SysTools OST to PST Converter is one of the best solution.
Q :

How to Open archive.ost file on a new machine?

Firstly, OST is an Offline file. It could not be accessible if you do not have Exchange server synched with your Outlook. To open it in Outlook, you need to convert OST to PST format only. And this is the best solution for conversion.
Q :

How to Convert OST to PST format for Outlook 2016 without Exchange Account?

Yes, you can easily convert OST to PST file format from Outlook 2007, 2010, 2013 ,2016, 2019. This tool supports both ANSI and UNICODE OST file. So, within a few clicks you would be able to extract OST file to PST which is importable in all Outlook versions. Moreover, the tool provides email filter during export for selective PST data extraction.
Q :

How Can I Move OST file to New Computer?

If you Want to Move OST file to new computer then first you have to Convert .ost to .pst file format. After saving the resultant OST file data the user can easily move the OST file to new Computer.
Q :

Can I convert my outlook.bak to .pst file?

Yes, BAK file is the replica of your OST file. You can get emails, contacts, calendars, tasks and notes data from that bak file using this OST to PST software. The tool supports outlook.bak file conversion into PST, EML, MSG, & HTML format.
Q :

What is The Difference Between Demo and Full Version Software?

The free demo version only allows you to save the first 25 items in each folder. And there are no restrictions in the full version.
Q :

How Much Time Will This Tool Take to Complete The Conversion?

It is determined by the size of the OST file and your system configuration. The SysTools OST to PST converter employs a multi-threading technique. It ensures that the conversion process is completed quickly.
Q :

Can I Run Multiple Instances of Software at The Same Time?

No, you can run only single instance of SysTools converter for OST to PST at a time.
Q :

Is it possible to convert another user's OST file on my system?

Yes, you can use the software to convert orphaned OST files to PST format. This means that the tool is not reliant on the user's profile or server connectivity.
Q :

Which License Should I Purchase for My Personal Use?

SysTools offers several licensing options (Personal, Corporate, Technician, and Enterprise). For personal use, you can buy OST to PST converter personal license.
Q :

Is it possible to use this software as a portable?

No, This is not a portable software. But you can browse the OST file using any external device for conversion of OST to PST format.
Q :

How This software will be delivered?

SysTools provides instant delivery of convert OST to PST tool via email. After completing payment process, user will get an email from SysTools' official email address. In this email user will get the software Download Link and Activation Code.

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