Regain OST to PST Converter

Professional Solution to Repair and Convert OST Files

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(Average Rating 4.9 based on 1843 Reviews)

Regain OST to PST Converter is a professional utility to effortlessly and efficiently convert .ost files to .pst file format. This utility also provides rid of inaccessible and corrupted OST files by regaining inaccessible OST file data. The tool effectively recovers OST files and converts them into working PST files even when your MS Exchange is not accessible. It is embedded with advanced features to export OST file items (Emails, Contacts, Notes, journals, Calendars, Tasks) to many file formats and importing to Cloud platforms. A trial version of the utility is also provided so users can check the tool's efficiency.

Download trial version and migrate 30 items per folder free

  • Regain OST to PST Converter instantly adds and converts OST to PST format in batches.
  • Users can preview added OST files before converting them into PST format.
  • The software doesn't alter the folder hierarchy and data integrity.  
  • Apart from PST, it also permits exporting OST into Office 365 and Live Exchange mailboxes. 
  • It is one of those few OST converter tools that can also migrate OST files to Gmail, Yahoo mail, Hotmail, Amazon Work email, etc.
  • You can save OST files' email into EML, EMLX, MSG, PDF, MBOX, vCard, HTML, TGZ, and ICS file formats. 
  • You can set a file size for the resultant PST file to save them from corruption due to oversize. 
  • The software is compatible with all Outlook OST files and Windows Operating System versions.  
  • You can download the free OST to PST converter version and check the software compatibility and working without any investment.
Regain OST to PST Converter
Most Secured approach to Convert OST to PST Format

Many businesspersons have recommended Regain OST to PST Converter tool for OST to PST conversion task. It is a convenient tool, and everyone, including novice users, can utilize it.

Convert OST to PST in simple steps:
  1. Step 1: Install and open the Regain OST to PST Converter tool.
  2. Step 2: Add Outlook OST files or folder and click to Start Scan.
  3. Step 3: Now, it displays a mailbox preview; cross-check your data.
  4. Step 4: Click on the Export option.
  5. Step 5: Select PST file as the desired file format.
  6. Step 6: You can also set size for the resultant PST file.
  7. Step 7: After completing all steps, click the Convert Now button.

Prominent Features of Regain OST to PST Converter Tool

Exchange OST to PST Converter

It is one of the best Exchange OST to PST converters, as it can recover corrupted OST files and process orphaned OST files. The software converts every bit of data from added OST files, including To, CC, BCC, Subjects, and Attachments.

Convenient Graphic User Interface

Regain OST to PST conversion solution offers a convenient GUI, and users can accomplish their OST conversion task in a few clicks. Its easy-to-use GUI makes the conversion task a cakewalk, even for novice users. Also, you don't need any prior technical knowledge and assistance to use the software.

Data Preview before Conversion

Assurity before conversion is a must, and Regain Software knows. That's why we offer a data preview of added OST file data before converting it into PST format. You can preview From, Subject, To, Cc and email. You can even see the emails with attachments.

No Restriction Tool 

Regain OST to PST converter tool doesn't impose any restriction on adding multiple OST files. You can add and convert OST files in batches without any size restriction. The software works with accuracy with multiple OST files as a single file. There will be no effect on software productivity in converting multiple .ost files.

Make PST of Desired Size

Outlook PST files can get corrupted due to oversize, and to save you from this scenario; we offer a split option in the tool to reduce the resultant PST file size. Using the split feature, you can choose a specific size for your resultant PST files and save them from corruption. This feature also helps in PST file management.

Convert OST into Different Formats

With the Regain OST to PST converter, you can also convert your OST files into several formats, such as MBOX, MSG, EML, vCard, ICS, etc., file formats. Converting OST files into these different formats offers accessibility flexibility and reduces the risk of data loss.

Filter Option

OST files can keep unwanted data, and to remove these unwanted emails from PST files, Regain OST to PST Converter offers several filter options. You can select folder/subfolders from the left pane to only convert selected folders. You can also check the box adjacent to the remove empty folder option to eliminate empty folders from the process.

Migrate OST to Cloud Server

Undoubtedly, the cloud is the new future, and several organizations prefer cloud services over Outlook. By keeping this in mind, Regain Software's OST to PST Converter tool offers direct OST file migration into several cloud platforms. You can import OST to Gmail, Yahoo, Amazon Work Mail, Office 365, etc.

Export OST to Live Exchange

If you're a bit techy, you may know that OST files are basically connected to Exchange Server. Regain OST Converter allows you to export OST files directly into Exchange Server mailboxes. During or after the export process, you'll not face any issues.

Keeps Meta-properties Intact

Data alteration is the worst scenario for a businessperson, and several third-party tools fail to maintain folder hierarchy and data integrity. But with the software developed by Regain Software, your folder hierarchy and data integrity will remain intact. The software makes the OST to PST conversion task as easy as cutting a cake. You can have a demo and ensure before purchasing the license.

Free Technical Support

Regain software takes its client as an utmost priority. We have made our software user-oriented. However, if you still face any issues or want to ask us anything related to software, our technical experts are available 24×7. You can ping us anytime, and there will be no charges for this; even if you haven't purchased the tool or have any questions related to the tool, you can ask our experts.

Free Trial Version

Assurity before purchasing is always a first priority in today's online world, and it's a good thing. For the same, Regain Software offers its software with a free trial version. The free OST to PST converter version is a restricted form of paid ones that allows processing the first 30 items per folder. There is no restriction with the licensed version.

Regain OST to PST Converter

Technical Specifications

System Requirements

  • Processor - Pentium Class
  • Memory - 512 MB
  • Hard Disk - 50 MB of free space

Version Supports:

  • MS Outlook 2021, 2019, 2016, 2013 (32 bit and 64 bit versions)/ 2010 / 2007/ 2003/ 2002/ 2000
  • Operating System - Windows 11, 10, 8.1, 8, 7, Vista, XP

Get A Free Trial of OST to PST

Software Features

Trial Version

Full Version

Convert OST File to PST
Easily Convert large-size .ost file
Save OST files into PST, EML, MSG, MBOX, EMLX, PDF, TGZ, HTML, ICS, VCF (vCard) format
Import OST file to Office 365/ Live Exchange Server
Export OST file to Gmail, Yahoo Mail,, GoDaddy, Amazon Workmail
Maintain all folders hierarchy and email properties
Show Preview of emails before Saving
Free Technical Support
Saving Capabilities Save 30 items/Folder Unlimited

When to use Regain OST to PST Converter?

Regain OST to PST converter is the best approach to convert OST to PST file format, even orphaned ones. Also, you can use this tool in the following scenarios:

If you have multiple OST files and are short on time, this professional utility will provide you with a speedy and efficient conversion. You can add numerous .ost files to convert them concurrently in batches.

This tool is a boon for you if you are a non-technical user and are uncomfortable with complicated technical tasks. Regain OST to PST Converter has a very user-friendly GUI and converts in simple steps.

If your OST file has become inaccessible or corrupt, you want to recover your mailbox data. Regain OST to PST Converter will help you regain data from severely corrupted OST files.

Suppose you want to create a backup of your important data in case of unforeseen circumstances. You can use this utility to save your OST files data into PST files in a proficient manner.

If you want to access your mailbox data across multiple devices or email clients, you can make it portable by converting OST to PST. In this scenario, Regain OST to PST Converter will help you.

When you have multiple tasks with the OST files, then this utility is best suitable for you. Along with converting OST to PST, it is also capable of importing OST files to Office 365, Live Exchange, Amazon WorkMail, Hotmail, etc.

Why Prefer Regain OST to PST Converter?

User-friendly Interface: OST to PST Converter has a simple and user-friendly interface that makes the conversion process easy, even for non-technical users. The GUI is designed to enhance user experience and is developed by keeping end users at the centre of the development process. A positive experience of our users with our software makes us a preferred choice.

Fast and Efficient: Speed and accuracy are one of the most required things for any professional. To provide a rapid and efficient solution for professionals, the tool is designed to convert many OST files to PST format quickly and efficiently.

Complete Data Recovery: This OST to PST Converter tool can recover your OST mailbox data, including emails, contacts, calendar items, notes, etc., from inaccessible or corrupt OST files. It efficiently retrieves severely corrupted or hard-deleted data from the OST file.

Multiple Saving Options: Other than converting OST to PST, this tool can save OST data into several other prominent file formats. Some available file format options are EML, EMLX, PDF, MSG, vCard, MBOX, HTML, ICS, and TGZ file formats. Users can easily choose the required format and convert data from the .ost file format.

Numerous Cloud Server Targets: The capability to do multiple tasks is also one of the main reasons to use this tool. It is not only restricted to the OST to PST conversion; apart from this, it also offers migration in Yahoo mail, Gmail, Hotmail, Office 365, as well as Exchange Server.

Control Over Resultant PST Size: Microsoft has recommended a maximum size of 50 GB for the PST files; hence, keeping the .pst file within is good. This advanced utility allows Users to set the size for the resultant PST files easily. You have to provide the size; this utility will automatically split it. This facility is very useful if you have large-sized OST files. Oversized files are always prone to corruption.

Benefits to Migrate Mailbox from OST to PST File

Recover Inaccessible Data: OST files may become inaccessible due to server crashes, corruption, etc. By converting OST to PST, you can recover all your mailbox data, including emails, contacts, calendar items, notes, etc. You can easily get severely corrupted and hard-deleted data.

Easy Migration: Migrating your mailbox from OST to PST is an easy and efficient way to access your data across multiple devices or email clients. PST files are easy to port and provide an enough recommended size of 50 GB from Microsoft.

Backup of Important Data: By creating a PST file, you have a backup of all your important data in case of unforeseen circumstances like server crashes or accidental deletion. Emailing contains crucial data, and backup always favours the user in any unwanted scenarios.

Accessibility in Downtime: For the timely update of the server, Exchange Server timely goes for maintenance hence the downtime. However, the Offline Storage Table keeps the mailbox data; but in synchronization. To access data on any system, anywhere; PST files are the best format with portability.

Storage Management by Archiving: PST files get stored in the local storage; hence no dependency on the server. By archiving mailbox data in the PST file format, users can manage the server's storage by reducing server load. As a result, users need less storage space; hence they can reduce the storage plans; OST to PST conversion task helps in cost-efficiency too.

Privacy and Security: From the users' point of view, having data in its place offers more privacy than having it on the server. Also, the PST file allows you to put in a password, and this password protection adds another layer of security that the end user loves.

FAQs - Convert OST to PST

How can I convert Outlook OST to PST in a few simple steps?

To Convert an OST file into an Outlook PST file, follow these simple steps:

  1. First, install the Regain OST to PST Converter.
  2. Click the 'Add Outlook Files' button and click 'Next' for scanning.
  3. Now software displays a preview of the mailbox after scanning the OST file
  4. You can check/uncheck the subfolders as needed, then click "Next."
  5. Click the Export button and select 'File Format.' For our task, here, we will select the PST file format.
  6. Click the 'Convert Now' button to complete the procedure.
  7. You will also get a complete report of the process.

Click the link, if you want to see OST to PST Converter’s working screenshots.

I have severely corrupted OST files; will this tool be able to provide me access to my data?

Yes. This tool is developed with a highly advanced algorithm; hence it can regain inaccessible data. This tool deeply scans the 'OST' file, recovers all emails and converts OST emails to another format.

What effect will be on the folder hierarchy after the OST to PST conversion?

The tool properly maintains the folder hierarchy and keeps the originality intact. You will find the same folder hierarchy after converting OST to PST.

How does this free OST to PST converter's demo version differ from the fully licensed version?

The demo version is just a restricted version of the licensed version. In working both are same. You can save only 30 items in each folder with the demo version. To save all converted emails, buy a license.

What should I do if I encounter difficulty using this product and am trying to figure out how to proceed?

We are round the clock available to our customers. Our dedicated team of technical support executives provides free technical support for our software-related tasks. Users can easily contact our support through email/ live chat, or telephone. You can write to us at for technical support-related concerns.

Is there any file Size Limit to convert the .ost file?

No. There is no file size limit. You can easily convert any size of the .ost file. You can easily convert a large size of data in a very efficient manner. Also, you can keep a limit on the resultant .pst file size to get rid of oversized .pst files.

Related blog: Reduce OST file size in Outlook

How would I know if the OST file is corrupt?

An OST file generally becomes inaccessible if it gets corrupt. You may want to open the file but cannot. Rather you may get some error messages showing corruption in OST files. Here are some of the common error messages –

  • The file has several conflict items.
  • Errors when synching the mailbox of the Exchange Server to the OST file.
  • Internal Error (Code = 00000003).
  • Unable to extract the folder. Some folders are not opening.
  • I cannot open default folders. The xxx. ost is not an offline folder.
  • Can't open specific Outlook items in offline mode
  • Outlook gets hung and crashes when accessing a specific folder

To know more in details visit here: OST File Corruptions and Their Solutions

Is having MS Exchange Server to run Regain OST to PST Converter necessary?

No, it does not require. Software only requires an OST file, whether it is healthy or corrupted. The rest of the thing, Regain OST to PST Converter, will do. Orphaned OST files can also be converted.

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