To export an MBOX file to PST, you can use third-party converter tools like MailsDaddy, which offer a simple way to convert MBOX files to PST. After installing the tool, you import the MBOX file, select PST as the output format, and start the conversion.

Alternatively, you can manually transfer emails by importing the MBOX into Thunderbird, syncing it with an IMAP email account, and then setting up the same IMAP account in Outlook. Once the emails sync, you can export them to a PST file from Outlook.

If you are not technically expertise then you should try MailsDaddy MBOX to PST Converter tool to migrate data from MBOX-based email client to Outlook,