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Thanks for the suggestions! The DbxConv method worked successfully 
All I actually wanted was to merge the imported OE Inbox and Sent folders with the current Opera Mail contents. The problem with "Import Outlook Express" is that is does not offer the opportunity to browse for the OE folder or files, and I could not work out where Opera expected to find it.
I have a problem importing an email database from Win XP Outlook Express to Win8 Opera Mail 1.0.
Opera Mail will not recognize the file structure copied from the old machine. Importing to an Opera Mail installation on the old PC first, and then transferring the Opera mail folders to the new Win8 PC was not successful either. Is there a trick to get around this?