Outlook on Windows has no MBOX import. It only imports PST and CSV. To read the mail, open the .mbox at readmbox.com. To get it into Outlook, export the messages as .eml files and drag them into an Outlook folder.
MBOX is the format used by Gmail (through Google Takeout), Thunderbird and Apple Mail. Outlook on Windows uses its own PST format, and its Import/Export wizard only accepts PST files and CSV contacts. There's no MBOX option to find, which is why so many people end up searching for a converter.
If you only need to read, search or print old mail, you don't need it in Outlook at all. Open it at readmbox.com. You can search by sender or subject, filter by date, and export what you need to CSV, PDF or EML. Nothing is installed and nothing is uploaded.
No PST export. This tool doesn't create PST files. The EML route keeps every message intact and works without installing a converter. For a very large mailbox, move it in batches (one year at a time, for example) so Outlook isn't swamped.
Most of them make you upload your mailbox to their server, which means handing your entire email history to a company you know nothing about. Desktop converters avoid the upload, but you have to install software, often Windows-only and sometimes flagged by antivirus. Here the conversion happens in your own browser.
Reading, searching and exporting a single message are free. Exporting many messages as EML is part of the one-time $29 unlock, with no subscription.
No. Outlook on Windows only imports PST and CSV files. Read the MBOX in a browser viewer, or convert the messages to EML and drag them into Outlook.
This tool doesn't make PST files. Export the messages as .eml files instead, then drag them into an Outlook folder. They keep their headers and attachments.
Yes. Double-click one to open it, or drag a batch of them onto a folder in Outlook to add them to your mailbox.
Many online converters upload your mailbox to their server. This one runs entirely in your browser, so the mail never leaves your computer.
Ready? Your file stays on your computer.
Open your .mbox file