Step 1: Convert OST to PST. Launch MS Outlook. Go to the File menu and click on the Open & Export option.
Step 2: Import PST to Thunderbird. Launch Outlook. Make Outlook the default program for email.

This May Work,
Peter

The users can try the ConverterTools OST to PST Converter Tool. This tool is designed to convert OST to MBOX files as well as other file formats such as PST, EML, MSG, TXT, etc. In addition, it permits users to import their OST files into various email clients for example Gmail, Yahoo, Office 365, Opera Mail, and so many others. However, it converts the files with their attachments items like calendars, contacts, tasks, and so many others.
To know more about this tool you can visit our website.

Do you want to convert your OST files into MBOX format then use the OST to PST Converter tool. It converts OST files, including all email messages, attachments, calendars, contacts, and other mailbox items, to MBOX format. By using the selective conversion feature, you can choose specific OST files or folders to convert to MBOX. This gives you the flexibility to convert only the necessary data instead of the entire mailbox.

Use one of the best tools is OST To PST Converter. It is the most reliable software that converts OST files to PST format. The utility is fully loaded with highly advanced features considering the requirements of high-tech users. Moreover, it is also capable of converting OST files to different files or folders and several email clients. Additionally, it supports all versions of the Windows operating system. You can try the trial versions of the software to analyze the performance.

The ideal method to move Outlook OST files to MBOX is to use the vMail OST to MBOX Converter. The finest and simplest tool for exporting OST data files to MBOX is this one. Multiple OST files can be converted to MBOX at once with its assistance. Moreover, there are no restrictions on your ability to export huge OST files. All versions of Windows, including Windows 11, are compatible with the program. Download the application's free trial versions.
Conversion of OST files to MBOX and EML formats is supported.
Support for Thunderbird MBOX and OST in their most recent iterations, as well as Apple Mail message previews of Outlook OST files before conversion.
All Outlook Folders are Merged into One MBOX File.
Get more info- https://www.vsoftware.org/store/ost-to-mbox-converter/

Convert corrupted OST files into MBOX format with this tool The SameTools Convert OST to PST Software is a smart application with an interactive interface. whether you are looking to convert big small or big-sized OST files, the tool provides complete conversion assistance. It converts OST to MBOX with the proper file format it won't miss a single piece of data like emails, messages, or contacts, that is selected by the users. Users can operate this application without Outlook and can operate with all Outlook version files 2021, 2019, 2016, 2013, 2010, 2007, 2003, etc. If users want to use this tool then download this application on Windows 10, 8, 7, XP, Vista, etc., and use the free demo version which is available for new users.

Now it is the best and easiest universal solution to convert OST data into MBOX file format without any complication and without putting extra effort users will get their OST files in MBOX format with the help of this ToolsBaer OST to PST conversion Tool is a safe and instant way to use software and a person who is not very tech-savvy can use this converter as well. It converts your all data into OST to MBOX without any third extension and it has a feature to ignore empty files. Users can download this utility on all Windows operating systems and convert a few OST files free into MBOX formats. It is definitely the best tool with the best characteristics to manage bulk and any size of files at one time. This software has a free demo version for further information install it.

Try this osttopstapp OST to PST Converter Tool to helpful for all corrupted OST files to access, then Convert OST file data into other different formats like PST, EMLX, EML, MSG, etc., and convert all data of OST files such as emails, contacts, attachments, calendars, time, drafts, notes, etc. This tool is designed with a Simple Graphical User Interface. this application supports Outlook, Apple Mail, Thunderbird, Windows Live Mail, and other platforms mailboxes the free demo, users can quickly convert a few files from each folder of OST files without any technical error or having to pay anything. This is fully supported by all Windows OS install and use the free trial,