EmailDoctor

MBOX to PST Converter exports multiple MBOX files into PST format in bulk. Its long list of features includes auto-detection of mailbox, selective emal conversion, selective file conversion, batch/bulk conversion, split PST option, email preview, etc. It supports 20+ email clients without any issues:
MBOX to Outlook
Thunderbird to Outlook
Apple Mail to Outlook
Eudora to Outlook
Turnpike to Outlook
Google Takeout to Outlook
Gyaz Mail to Outlook
PowerMail to Outlook
Spicebird to Outlook
Sylpheed to Outlook
Opera mail to Outlook
Seamonkey to Outlook
Netscape Mail to Outlook
Backupify to Outlook
Entourage to Outlook
Postbox to Outlook
Claws Mail to Outlook
Google vault to Outlook
Mulberry to Outlook
The Bat to Outlook
Horde to Outlook
Evolution to Outlook
Pocomail to Outlook
Sparrow mail to Outlook
GNUMail to Outlook