GainTools OST Converter

What Is GainTools OST Converter?

GainTools OST Converter is a Windows application designed to convert, export, restore, and recover Outlook OST mailbox data. It runs independently of Microsoft Outlook, so a mailbox can be extracted even on a machine where Outlook is not installed, and the conversion itself does not need an internet connection. The platform can export OST content to PST, EML, EMLX, MSG, MBOX, and VCF formats. This allows organizations to move mailbox information into different email and storage environments.

Users can preview mailbox folders and select the information they want to export before conversion. The application also provides file filtering, allowing users to locate OST files stored across different drives and folders.

What Is GainTools OST Converter Best For?

The software stands out for its ability to process OST files that Outlook can no longer open. It scans cached, encrypted, orphaned, corrupted, and password-protected files. The system then extracts items such as emails, contacts, and calendars into a usable format. This matters most for IT teams dealing with mailboxes affected by profile or synchronization errors, where the data would otherwise stay locked inside an unreadable file. With this feature, recovery becomes a repeatable routine rather than a specialist task.

How Much Does GainTools OST Converter Cost?

GainTools OST Converter cost for a lifetime license is $39. The software also offers a free trial, allowing prospective users to evaluate its capabilities before deployment.

In addition to the base license cost, organizations should account for the following potential expenses:

• Additional Licenses (Multi-Machine Or Team Use): $39–$49/extra license for small teams. IT service teams may need $199–$299 corporate or technician-style licensing, based on competitor benchmarks, if a multi-system tier is introduced
• PST Splitting, Merging, And Cleanup Tools: $29–$149, depending on whether these are bought as separate utilities or bundled
• Migration To Microsoft 365 Or Exchange: $0–$150 in tooling, since converted PST files can usually be imported with native Outlook or Microsoft 365 import methods
• IT Labor For Conversion And Validation: $200–$1,500 for small businesses with a handful of mailboxes

Disclaimer: The pricing is subject to change.

GainTools OST Converter Integrations

The vendor has not listed any available third-party integrations for this software.

How Does GainTools OST Converter Work?

Here's how you can get started with the software:

• Download and install the application on a Windows system
• Launch the software and add an OST file with the Browse button, or search drives and folders to locate one
• Review the file in the preview pane, checking folders, item counts, and message details to confirm it is the right file
• Select the folders and items you want to export
• Choose an output format, such as PST, EML, EMLX, MSG, MBOX, or VCF
• Set a destination folder for the converted files
• Click ‘Convert Now’ to start the export process
• Open the exported files in the target email application to review the results

Who Is GainTools OST Converter For?

GainTools OST Converter serves the following:

• IT services
• Managed service providers
• Small businesses
• Enterprise IT departments
• Individual professionals

GainTools OST Converter Use Cases

Analysis of GainTools OST Converter features and user feedback highlights several scenarios where the software can support IT teams and Outlook users. These include:

1. IT Teams Moving Staff From Outlook To Thunderbird Or Apple Mail

Organizations shifting users away from Outlook often hold years of mail in OST files that other clients cannot read. GainTools OST Converter helps users export those files to MBOX, a format Thunderbird and Apple Mail can import. Because the process runs locally without an internet connection, administrators can convert files workstation by workstation.

2. Administrators Converting Oversized Mailboxes Without Splitting OST Files

Administrators handling long-running or oversized mailboxes can use GainTools OST Converter to convert large OST files without splitting them beforehand. The software has no restrictions on the size of OST data it can convert. This allows teams to move large mailbox contents into PST or other supported formats for subsequent access and review.

3. IT Professionals Recovering Only Critical Data From Inaccessible OST Files

GainTools OST Converter helps IT professionals extract only the mailbox data they need when an OST file cannot be accessed normally. They can preview the file and select specific items, such as an inbox, note, or individual message, rather than converting the entire mailbox. This focused extraction can keep the resulting PST smaller and make targeted data recovery more manageable.

4. Departments Reusing Contacts, Calendars, And Other Non-Email Data

Departments can use GainTools OST Converter to extract contacts, calendars, notes, tasks, and journals when transferring or reusing an Outlook account's data. The software supports multiple output formats, including VCF for contacts. This allows teams to move selected non-email information into applications or workflows that support those formats. It can be useful when an account handover involves more than email records.

Is GainTools OST Converter Right For You?

GainTools OST Converter suits businesses and individual users who need to pull Outlook mailbox data into a portable format without depending on Outlook itself. It supports Windows 11, 10, 8.1, 8, and 7. The software works without an internet connection and preserves mailbox structure and non-English characters during conversion.

As organizations increasingly connect digital workplace systems, maintaining access to business email data has become an important part of productivity and collaboration strategies. Microsoft’s 2026 Work Trend Index emphasizes the need to connect data across systems, while Microsoft 365 provides dedicated services for migrating organizational mail and file data.

GainTools OST Converter supports this trend by converting Outlook OST files into different formats. It can export emails, contacts, calendars, tasks, notes, and other mailbox items, while selective export and preview capabilities allow users to choose the data they need. This can help IT teams preserve access to business mailbox information during Outlook data recovery, platform changes, and migration workflows.

Are you still not sure about GainTools OST Converter and need expert advice to make an informed decision? Reach out to us at (661) 384-7070 for further guidance.