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Managing Director KernelApps

Salient Features

Go through the advanced features of the OST to Thunderbird Import tool:

Import OST files to Thunderbird

Import OST files to Thunderbird The tool converts OST to MBOX and lets you access OST files in Thunderbird. The entire process completes in just three steps. It supports Exchange OST files as well as OST files created by IMAP account configurations in Outlook.

Import all OST emails

Import all OST emails Access OST all email folders like Inbox, Sent Items, Outbox, Deleted Items, etc., in MBOX email clients like Thunderbird using this tool. The tool retains email properties like From, To, Subject, Cc, etc., during the import.

Import specific OST emails

Import specific OST emails With the OST to Thunderbird tool, you can import emails selectively using its advanced filters. You can import emails of a specific date range, emails from a particular sender, emails to a particular recipient, etc., selectively.

Import inaccessible OST items

Import inaccessible OST items Importing corrupt or damaged OST files is possible with this tool. After adding the OST file to the tool, you can verify its emails on the preview pane and then import them to Thunderbird or any other destination. Even orphaned OST files can be imported this way.

Easy OST to Thunderbird import

Easy OST to Thunderbird import The tool owns a simple GUI, which facilitates easy OST file import. The buttons and the interface are so intuitive that even non-technical persons can import OST files without any help from others.

Import OST to all MBOX email clients

Import OST to all MBOX email clients In addition to Mozilla Thunderbird, OST files can be imported to all major MBOX email clients like Eudora, SeaMonkey, Opera, Netscape, Spicebird, PocoMail, and more. Also, OST files can be converted to MBOX files supported by Apple Mail and Entourage email clients.

Import to multiple destinations

Import to multiple destinations It is more than an OST to Thunderbird import tool. It allows you to save OST files to live Exchange Server, Office 365, Gmail, Outlook, and many other applications, platforms, and file formats.

Import to all Thunderbird versions

Import to all Thunderbird versions The Kernel OST to Thunderbird Import tool supports all the versions and releases of Mozilla Thunderbird – from Thunderbird to Thunderbird 31 and the latest versions. Similarly, it supports all the versions of all the popular MBOX email clients.

Using this tool, you can import OST files to Mozilla Thunderbird in a few simple steps:
  1. In this tool, add the OST file from its location for scanning.
  2. Preview the OST file data in detail.
  3. Select the MBOX file as the saving option and apply filters as per the need.
  4. Choose Thunderbird as the email client and provide the MBOX file saving destination.

Wait for a few seconds, and your OST files will be converted to an MBOX file. You can easily import this MBOX file to your Thunderbird application.

Yes. Kernel Import OST to Thunderbird support even the latest versions and releases of the Thunderbird application.
Definitely; it supports OST files created by the latest versions of Exchange Server/Outlook. It supports OST files of IMAP servers as well.
Apple Mail, Entourage, Eudora, Postbox, Netscape, PocoMail, Thunderbird, Spicebird, Opera, PowerMail, Claws Mail, Evolution, SeaMonkey, Sylpheed, Mulberry, GyazMail, Gnu, Sparrow, and the Bat!
You can import OST files to any destination using this tool. The popular destinations are:
  • Email clients – MBOX email clients, Outlook Express, MS Outlook
  • Email Servers – Exchange Server, Office 365, GroupWise, Domino
  • Web Mails – Gmail, G Suite, Yahoo, AOL, Hotmail, iCloud, Company IMAP
  • File Formats – MSG, EML, TXT, RTF, HTML, MHTML, PDF, DOC, DOCX
No. This tool runs on Windows machines only. You can convert OST files to MBOX format on a Windows machine and then transfer them to a Mac machine to use on any MBOX email client supported by Mac.

Supported Versions MS Exchange Server - 2019/2016/ 2013/2010/2007/2003/ 2000/5.5 and 5.0
MS Outlook - Office 365/2019/2016/2013/ 2010/2007/2003/2002/2000/98 and 97
Outlook Express - 6.0/5.5/5.0 and 4.0

Operating SystemWindows 10, 8.1, 8, 7, Vista, XP, 2000, 98, NT, 95
Windows Server 2016/2012/2008 R2/2008/2003 R2/2003

ProcessorIntel® Pentium Processor compatible (x86, x64) or equivalent

Memory + Hard Disk 128 MB Minimum
50 MB of disk space

Home LicensePermits home users to use the software on single system for life time

Corporate License For multiple machines within one organization at single location

Technician License For service providers to use for multiple organizations

Electronic Yes


User Reviews

Kernel Import OST to Thunderbird

(5 / 5) 430 Reviews

All the files are transferred with their attachments safely to Thunderbird. I am happy with the software features and functionality.


Impressed with the software free evaluation version. To get its complete advantage, I am going to purchase it. Very powerful tool.


A perfect tool for email migration, even for a non-technical user like me. You just need to follow a few simple steps to import data from OST to Thunderbird.

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