If you are searching for a reliable converter for MBOX to PST file then I can suggest a converter that is safe and securely. Then I can say you can easily use ToolsBaer MBOX to PST file converter that convert bulk mails files into PST Files without any interruption. This tool can effortlessly convert your multiple MBOX files to PST in a single go without losing a single piece of data. This tools support all email clients of the MBOX file, like thunderbird, Apple mail, Poco mail, Sea monkey, etc. A free trial version is given to new user and free of cost you can download it but if you purchase once in lifetime then you can use its paid version lifetime.
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https://www.toolsbaer.com/mbox-to-pst-conversion/