You can get solution from: https://gallery.technet.microsoft.com/Export-MBOX-to-PST-EML-MSG-11c02f78
Best posts made by vksjacob
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RE: How to Import Mail from Outlook to Opera Mail?Opera for Windows
RE: Migrating to OPERA Mail from OutLookOpera for Windows
You can also get solution from: https://gallery.technet.microsoft.com/Export-MBOX-to-PST-EML-MSG-11c02f78
How to Export Mail from Opera to MS Outlook (PST) file?Opera for Windows
If you are looking tools from exporting mails from Opera MBOX to Outlook, try Opera to Outlook PST conversion tool to easily export all mails from Opera to MS Outlook PST file format. It also export emails from Opera to Office 365, EML, MSG and Live Exchange Server with all email properties. This software successfully export the items from MBOX file of Opera email clients into different file format like PST, EML, MSG, Office 365 and Live Exchange Mailbox. It allows the users to created new Outlook profile at the run time of software and exporting data into them successfully or exporting data into existing Outlook profile.