MBOX converter software
"If you want to move Thunderbird to Outlook 365, then use the best software, which is eSoftTools MBOX converter software. It has superb skill sets that quickly turn your single as well as bulk Thunderbird to Office 365 or PST, HTML, NSF, MSG, EML, EMLX, and other formats, and it will support all versions of MS Outlook 2019, 2016, 2013, 2010, 2007, & 2003." All email headers, formatting, and content are preserved during conversion.During conversion, all email header, formatting, styles, are protected. It can also offer a trial pack in which users can change the initial 25 emails of MBOX to Office 365 or required file formats.
Read more;- https://www.esofttools.com/mbox-converter.html
Jenny Carner commented
SYSessential MBOX to PST Converter is a powerful tool that lets you convert MBOX files to Outlook PST format with ease. This MBOX Converter tool can convert MBOX files to PST files without losing any data. The utility supports all MBOX file supported email clients database such as Apple Mail, Eudora, Entourage, Poco Mail, Opera Mail, Gmail, etc. It supports all versions of Windows and Microsoft Outlook. here users can transfer multiple MBOX files into single or separate PST files.