Discover the leading SaaS software comparison site

Each month we help +100k companies to find efficient online tools

OST4 Review

starting price $39
our score 82%
free trial
  1. What is OST4
  2. Product Quality Score
  3. Main Features
  4. List of Benefits
  5. Awards Section
  6. Technical Specifications
  7. Available Integrations
  8. Customer Support
  9. Pricing Plans
  10. Other Popular Software Reviews

What is OST4?

OST4 is a robust OST to PST converter that works even when you do not have a Microsoft Outlook program. It can export your emails, notes, attachments, tasks, and calendar information. On top of that, it can migrate your data including the metadata. You can also be certain that your information is complete because the software does not modify your files in any way during and after the conversion. With OST4, you can see what the converted files look like during the process. With this preview, you can be confident that your files are in the same state from the receiver and sender fields to the subject and content. Apart from those capabilities, you can also put OST4 for to task when it comes to converting OST files to other formats apart from PST. Hence, you can maximize the software’s features.

Product Quality Score

Ease of use
Customer support
Value for money

OST4 features

Main features of OST4 are:

  • OST File Repair
  • Recovered Emails Preview
  • Folder Conversion
  • OST to Office
  • Live Exchange Server Transfer
  • OST to PST
  • Data Migration with Metadata
  • Email Export

OST4 Benefits


The main benefits of OST4 are its secure conversion of files, mailbox conversion preview, support for different Outlook versions, Office 365, and Live Exchange Server, and its ability to convert OST files to other formats apart from PST. Here’s more information:

Secure File Conversion

If you have emails and attachments protected by strong encryption and password, you can rely on OST4. The software can convert such data with ease without modifying the files in any way. This gives you peace of mind that the confidential information embedded in the emails are secure.

Mailbox Preview

Even before the conversion process ends, OST4 lets you already see how the files will look like. This allows you to be certain that your emails, from the To, From, Cc, and Bcc fields to the subject, content, date, and time remain unchanged.

Multi-version Outlook Support

Regardless of the Microsoft Outlook version you are utilizing, you can expect OST4 to work with it. As such, you do not need another solution to recover your emails and files.

Office 365 & Live Exchange Server Support

With OST4, you can make your OST files work with Office 365 and Live Exchange Server. You only have to click the right buttons to transfer the files to your selected programs and you can continue with your workflow.

Conversion to Other Formats

Though OST4 is mainly used to convert OST files to PST, it can transform your OST data to other formats as well. The list includes EML, EMLX, MSG, MBOX, vCal, and vCard. Because of this, you only have to rely on one software to meet a variety of needs.

Awards Section

Great User Experience Award
Rising Star 2019 Award
In our OST4 reviews the software has been distinguished with our:
- Great User Experience Award
- Rising Star of 2019 Award

Technical Specifications

Devices Supported

  • Web-based
  • iOS
  • Android
  • Desktop

Customer types

  • Small business
  • Medium business
  • Enterprise

Support Types

  • Phone
  • Online

OST4 Integrations

The following OST4 integrations are currently offered by the vendor:

No information available.


Customer Support


Pricing Plans

OST4 pricing is available in the following plans:

Free trial
Personal License
$39/one-time payment
Corporate License
$99/one-time payment
Technical License
$199/one-time payment