You'll need to use a third-party tool to convert Thunderbird to PST files. I recommend that you use eSoftTools Thunderbird to Outlook Converter, which is one of the most dependable tools. This tool is very easy to use and will save you time and money. It can convert Thunderbird MBOX files to PST, EML, EMLX, MSG, and HTML, among other formats. While exporting the data, the Meta properties will remain unchanged.