To export opera to PST files format and batch convert several MBOX files, then you can download the eSoftTools MBOX Converter Tool. It converts all email clients to the MS Outlook PST file format, including Mozilla Thunderbird, Entourage, Eudora, and Apple Mail. All of the standard email features, such as To, Bcc, Cc, and Sent, were retained. It can also support all versions of windows and MS Outlook.
Get more info- Opera Mail export to PST
Get more info- Opera Mail export to PST