After researching on the web, I mentioned a few strategies that help you to transfer MBOX files into PST file format.
Manual method to transfer MBOX to PST
First you need to import MBOX file into Thudnerbird
Export Emails from Thunderbird:
• Open Thunderbird and install the ImportExportTools NG add-on.
• Right-click on the folder you want to export, choose ImportExportTools NG and select Export all messages in the folder as EML format.
Import EML Files into Outlook:
• Open Outlook and create a new folder.
• Drag and drop the exported .eml files into this folder.
The above method may be helpful for some users who are technically well because to perform this method you require proper technical expertise. So, for a safe and secure conversion, you can use a professional tool like Softaken MBOX to PST Converter Software. With the help of this program, you can easily transfer your batch of MBOX files to PST format. Additionally, this software flawlessly works with all later or newer versions of Microsoft Windows OS.
Read More: https://www.softaken.com/mbox-to-pst-converter