Convert mbox to msg
A browser can't do this one — here is what it can do.
Desktop app only
Nothing that runs in a tab can write msg from mbox. This pair is waiting on the desktop build, which hands the job to the real command-line tools.
Browse what does workOther mbox conversions eml
About MBOX
MBOX mailbox
A plain-text format that stores many emails in one file, each starting with a line that begins with 'From '. Thunderbird keeps folders this way, and Google Takeout exports Gmail as MBOX. Convert from MBOX to read or search a mailbox export without importing it into a mail client.
About MSG
Outlook Message
Microsoft Outlook's format for a single saved email, a binary Compound File holding the message properties and attachments. Convert MSG to read Outlook messages on a Mac, a phone or any computer without Outlook.