Comprehensive Tool to Convert OST to PST

Stellar Converter for OST

Stellar Converter for OST is a powerful software to convert inaccessible OST files into Outlook PST files. The OST conversion tool easily converts all mailbox components- email attachments, contacts, calendars & deleted items - to the PST file. Works with Microsoft Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2002, and 2000.

  • Search and save individual emails within the same OST file

  • Convert encrypted OST files into PST files. Also works on IMAP OST files
  • Convert large OST files to PST - No file size limitation
  • Free OST to PST conversion for first 20 emails per folder
  • Easily export OST file to Office 365 & Live Exchange (Tech version)
  • Converts multiple OST files to PST format (Tech version)

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Why Stellar Converter for OST is #1 Software for OST to PST Conversion?

Stellar Converter for OST is the best OST to PST Converter tool available in the market today because it comes with a host of features that make conversion a breeze and, at the same time, recover all your mail components including deleted emails.This software is designed keeping you in mind. Its easy-to-use interface helps you access emails in the event of Microsoft Exchange failure, synchronization problems, accidental account deletion from Microsoft Exchange Server when changes are made to domain and exchange server, and more. Regardless of the tight spot you are in, Stellar Converter for OST can directly convert all OST files to PST and export them to Microsoft Outlook or even a new server.

Problems & Solutions

Inaccessible/Orphan or Corrupt OST File icon

Inaccessible/Orphan or Corrupt OST File

It’s common for IT administrators to come across situations like Exchange Server crash or mailbox synchronization problems which make an OST file inaccessible or orphan. Likewise, a user’s desktop may fail to boot due to hardware problem or malware infection, or the storage drive containing OST file may have large number of bad sectors. The outcome of these situations is a corrupt or inaccessible OST, with risk of losing the mailbox data such as emails, attachments, contacts, etc. Stellar Converter for OST converts inaccessible or corrupt OST file to extract the mailbox data as importable PST file.

Migration to a New Email Service icon

Migration to a New Email Service

When you migrate to a new email service, it’s a key challenge to get access to the mailbox data stored in OST files associated with user accounts configured in the older email service. This becomes more critical when there’s no PST backup of these OST files. So, in this case, you would lose the mailbox data stored in such OST files, unless you somehow convert the OST to an accessible format like PST. Our OST to PST converter software helps you by converting the OST file and extracting the entire mailbox data - emails, contacts, attachments etc. - in a PST file.

Migration to a New Computer icon

Migration to a New Computer

The OST file is a cache of the user’s Exchange mailbox on the local system, which can’t be directly imported in Outlook or opened on any another system. So when you migrate to a new computer, the data stored in the OST will be lost; unless you find a way to extract the OST data in a format like PST which can then be opened in the Outlook client installed anywhere, irrespective of the system. The OST PST conversion tool helps you with an effective solution to convert the OST and extract the mailbox data in PST format.

Difficulties with Outlook Import Export Wizard icon

Difficulties with Outlook Import Export Wizard

Outlook built-in Import Export Wizard is an amazing utility for migrating OST data to PST format. But the tool requires users to have considerable technical proficiency and spend time to get the expected results. It also needs the same Exchange account for this task, and you cannot convert corrupt OST files with the help of Import Export Wizard. Stellar Converter for OST software provides an easy and fast way to convert the OST file into PST via a rich Graphical User Interface.

Additional Advantages

Export OST to PST icon

Export OST to PST

An OST file stores a replica of your Exchange mailbox on the local system. This file lets you work seamlessly when the Exchange server experiences technical difficulties. There could be several reasons to export the data within OST file to PST format including damage / corruption of OST file, need to access OST file data on another local system, and more. This converter swiftly and smoothly extracts all data within OST files and saves them securely into a newly created PST file. The new PST can thereafter be imported into MS Outlook to access all data. See steps to convert OST file into PST using Stellar Converter for OST.

Convert all Exchange objects to Outlook compatible format icon

Convert all Exchange objects to Outlook compatible format

OST PST Converter Software ensures all Exchange mailbox objects like emails, contacts, attachments, notes, journals, calendar entries, etc. stored within OST files get converted into PST format. The tool considers all risk-factors and skillfully averts issues to achieve precise OST 2 PST conversion. You can make sure that all items have been converted by keeping an eye on the counter that the software displays against each mail folder were indicating the number of items converted.

Multiple Saving options for Individual Mails icon

Multiple Saving options for Individual Mails

The Powerful OST to PST Converter Software also provides you the option to search and save individual email messages from within OST files. In case you do not have the time to convert all OST items into PST, you can choose specific email messages to be extracted from the OST based on various parameters such as 'To', 'From', 'Subject', and 'Date' and convert them into a variety of formats including MSG, EML, RTF, HTML, and PDF formats. This feature lends this tool a high degree of flexibility making it stand above its competition. Read More

Organize Mail Messages Better icon

Organize Mail Messages Better

OST PST Converter Software gives weight to good mailbox organization. Once OST scanning is completed, and all recoverable items have been discovered, the product allows you to sort and organize your email messages by Date, From, To, Subject, Type, Attachment, Importance, etc. Additionally, it lets you further improve scan result readability by allowing you to segregate emails in groups through a convenient “Show in Groups” feature.

Customizable user-friendly options icon

Customizable user-friendly options

This product comes equipped with an attractive yet extremely simple GUI that makes working with it a breeze. Helpful instructions and appropriately explained options un-complicate things even for non-technical users. Moreover, some convenient alternatives such as a smart preview of objects before conversion, the choice to save converted data at any desired location on the system or network, picking choice of format to save individual mail messages, etc. make OST to PST Converter one of the best tools in its category.

Conversion of Encrypted OST file icon

Conversion of Encrypted OST file

User encrypt OST file to keep their important information secure from unauthorized access. Sometimes you may experience an error that it is not an Outlook Data file when tried to open encrypted OST file. In such situation, you might have lost access to your encrypted OST file. To overwhelm from the above issue, you need to convert your encrypted OST file to PST file format. OST converter tool helps you to fix encrypted OST file & safely convert it to PST file. Read More

Free OST to PST Converter icon

Free OST to PST Converter

The converter tool allows free OST file to PST file Conversion for 20 emails per folder. All you need to download the Free version of the software and scan your OST Files. After scanning, the software shows the preview of converted OST file & supports free conversion for only OST to PST file format. To save free 20 emails per folder, just click on ‘Save converted file’ button & converted OST file will save at your specified location.

Wide Compatibility icon

Wide Compatibility

One of the highlights of this tool is its compatibility with a number of MS Office versions. It supports MS Office 2019, 2016, 2013 (32 bit version and 64 bit versions), MS Office 2010 (32 bit and 64 bit versions) / 2007 / 2003 / 2002 (XP) / 2000.

Option to Save & Load Scan Information icon

Option to Save & Load Scan Information

Save the scanned information in the form of DAT file at one point of time, and upload this DAT file after a certain amount in time, to save it as PST. Through this feature, users can split the scan and preview process, and without repeating the scanning process lets the user save that file into PST, despite the fact that the two methods are performed at a different time interval. Read More

  • Particularly used when a user is too busy to carry out the whole operation at one-go.
  • DAT file ensures that time is not wasted in the repetitive scanning of the same data.
Batch conversion Module <img src=

Batch conversion Module

Batch Conversion procedure involves selection of as many OST files and their subsequent conversion into PST files, all at the same time, and at the same location. This option to save the corresponding PST into same location helps in tracing the PST files, with ease. An option to save at preferred location is also available. All OST files can directly converted into PST files or it can be done by splitting the PST files on the basis of either “Split by Date” or “Split by Size” option.
Batch conversion process is available with Tech version.

Convert OST to Office 365 <img src=

Convert OST to Office 365

Migration to Office 365 is easier with this software as the converted OST files are exported directly on Cloud Office 365. All you need to have is Office 365 account with valid login credentials. This software relieves you from the lengthy and time-taking mailbox migration procedure. Option is available with Tech version. This feature is available in Tech Version.

Split and Compact large PST files <img src=

Split and Compact large PST files

The Software provides two advanced options for new created PST file: Split & Compact. To compress the converted PST file, you just need to click on “Compact & Save PST” option and it decreases the size acquired by PST file in the disk. Another feature Split the large PST file is helpful if you have a bigger PST file and you want to break it in to smaller parts to avoid the possibilities of PST file corruption. These features are available in Tech Version.

Try Stellar Converter for OST Software for 100% Safe Conversion

*Free Download enables you to preview the converted file and save 20 items per folder.

Software Specifications

Stellar Converter for OST

System Requirement

ProcessorPentium Class

Operating SystemWindows 10, 8.1, 8, 7, Vista, XP

Memory512 MB Minimum

Hard Disk50 MB of free space

Software Delivery


License & Version

Single User LicenseCan use only on a single system

Technician LicenseCan be used on '3' Systems Simultaneously


Interface Available

Language SupportedEnglish, German, French, Italian, Spanish


Use following steps for successful conversion:

  • Run Stellar Converter for OST software.
  • Select your OST file from ‘Browse’ option.
  • Click ‘Convert’ button to start the scanning process.
  • Click 'Save Converted File' button to save OST file into Different file formats.
  • Select ‘PST’ file option to convert OST file to PST format.
  • Click on ‘Browse’ button to select destination path and click ‘OK’ button.
  • Congratulations, your PST file saved at your specified location.

The software will scan the OST file and list all the mailbox folders in the left pane. Click on a folder to preview its items and save them at a destination location.

With the demo version of the software, you can save only 20 items per folder. However, in order to save all the converted items, you need to purchase the full version of the software.

Yes, the software allows you to search for Offline Folders (OST) files in any folder, sub-folder, or drive in your system. You can use the 'Find Outlook File' option of the software to locate OST files in the selected drive and choose the desired file for conversion.

You may require migrating from OST file to PST in any of the following cases:

  • Your mailbox on the Exchange Server is deleted accidentally and you need to access your emails.
  • You are facing issues while synchronizing MS Outlook with Exchange Server.
  • You need to carry your business emails to a different workplace or organization

The time required by the software to perform ost to pst conversion heavily depends on the size of your OST file. The software efficiently scans your OST file and tries to deliver the best performance with reliable and accurate results.

For importing your PST file into MS Outlook, follow these steps:

  • Start MS Outlook.
  • On the 'File' menu, click 'Open' and then select 'Outlook Data File'.
  • Choose the PST file you need to import and click 'OK'.
  • After the process is completed, MS Outlook will create a new personal folder (PST) file.

The software gives the option to save the converted OST file in MSG, EML, PDF, RTF or HTML formats.

The Software does not perform any action on corrupt OST file. The software converts corrupt OST file into accessible PST file which you can easily import into MS Outlook to access all your OST file data.

If you face any problem during the OST file conversion or after the conversion, you can contact our support team

The software offers two versions – Corporate & Technician. If you only need to migrate OST file into PST file format then you should go for Corporate. Some advanced features of Corporate version are listed on the page. If you want to convert as well as compact & split large OST file then you should go for Technician version. Technician version also has the option to save OST file into Office 365.

You can easily take backup of your Exchange data by converting the OST file to PST file format.

Yes, the software converts OST file that is not connected to Exchange Server.

We provide demo version to check the preview of OST file. You can save 20 items per folder for free in the demo version. If the software saves 20 items in demo version then it guaranteed that software will convert OST file into PST file format.
Note: We strongly recommend to users to run the demo version of the software to check the product capability before purchasing the software.

The software allows finding the desired emails in your converted OST file and saving each email either as an EML , MSG, PDF, RTF and HTML file formats at any user-specified location in the system. You should follow the given procedure to find and save specific email messages using the software:

1. Once the scan is completed, click 'Find' button on the tool bar. The 'Search Messages' dialog box is displayed on the screen.

2. Click 'Mail' > 'Data Files'.

3. Specify the following search criteria in the dialog box:

  • To: Specify a part of the recipient's email address or the complete email address. You can separate the email addresses of different recipients using ';'
  • From: Specify the email addresses of senders. You can separate individual entries by a ';'.
  • Subject: Specify the subject property of the emails you need to find. You can provide a few characters, words, or the complete subject line of the email.
  • Date: Check the 'Select Date Field' check-box and specify the desired date. This will help to find all the emails sent or received on this specific date.

4. In the same dialog box, click 'Find Now'.

5. The software initiates the search process and displays all the found emails in the bottom pane.

6. When you right-click an email in the search results, multiple file saving formats will be displayed Choose the desired option to save the email in the respective format.

Yes, once converted, you can save the converted file in preferred format and to move that file to another system.

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