I faced the same issue when I couldn’t access my OST files after an Exchange crash. I used BitRecover OST Converter, and it worked perfectly. Here’s what I did:

Installed and launched the software on my PC.

Added my inaccessible OST files using the Select Files option.

The software automatically scanned and displayed all my mailbox items.

I previewed my emails and attachments to check the data.

Selected PST as the output format and chose a saving location.

Finally, clicked on Convert, and within minutes, I had all my emails restored in PST format.

It was quick, secure, and I didn’t lose any data during the conversion.

To export MBOX to Outlook, the manual way involves setting up an intermediate email account (like Gmail with IMAP), importing MBOX into an email client (like Apple Mail/Thunderbird), and then syncing it with Outlook. But this process is complicated and time-consuming.
A simpler option is to use a professional tool. I recommend Stellar Converter for MBOX, which directly converts MBOX files into PST format that you can easily import into Outlook. It preserves folder hierarchy, attachments, and email integrity, making the migration quick and hassle-free.