If you tried to convert MBOX to other file formats, such as PST, or move your emails from Mbox supporting clients to Outlook so I don't think it's possible without the help of a third party email migration application, And the application name is MBOX to PST Converter.
This is an effective and consistently good in performance and most trusted application that can convert MBOX mailbox of Thunderbird, Opera Mail, Apple Mail, Mozilla Mail, Sea Monkey, Gnu, Entourage, Eudora, PocoMail, Netscape, Evolution, Mulberry and Spicebird, Mutt etc.
It can Save converted emails in RTF, Office 365, PDF, RTF, and HTML format. It features an option “Find File” with which you can search for all the Mac MBOX, MBoX, MBX and AppleMail data in the desired drive, folder and subfolder. Complete email data can be flawlessly converted with all the MBOX objects like To, From, Cc, Bcc, Sent, Subject, Attachments and more.
- It Supports MS Outlook 2007, 2010, 2013 and 2016.
Free Trial Version Available. Download Now! : http://www.tools4recovery.com/mbox-to-pst-converter.html