Yes, there are many solutions available over the internet to migrate file from Outlook to Opera Mail.I was also searching the solution for the same. Finally I found this link: http://www.bitrecover.com/blog/convert-outlook-to-opera-mail/. This blog helped me in converting Outlook email files to Opera Mail. Give it a try at least for once and I am sure this will solve your issues too.
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RE: Migrating to OPERA Mail from OutLookOpera for Windows
How to Import Mail from Outlook to Opera Mail?Opera for Windows
Finally I found a professional technique to import mail from Outlook to Opera Mail without missing a bit of important data like emails, attachments, inline images, internet header and HTML links. I was looking for a solution to transfer all emails from Microsoft Outlook to Opera Mail from past few days then my business friend suggested me a great technique to import mailboxes from Outlook to Opera Mail after that I have follow some steps to convert Outlook to Opera Mail and got success.
If you have same query related to import Outlook to Opera Mail then read this article: http://www.bitrecover.com/blog/convert-outlook-to-opera-mail/
I hope that this article will be helpful for a lot home and corporate based users because here complete information is available about how to import mail from Outlook to Opera Mail with screenshots.