Converts Opera Mail MBS mailboxes to MBOX in batch, so old Opera emails open in Thunderbird and other MBOX email programs. Command-line edition from Birdie Software.
Birdie Opera to MBOX Converter (also called Birdie Opera2MBOX Converter) from Birdie Software moves emails from Opera Mail to the MBOX format. This page covers the CMDL (command-line) edition, for automated and scripted conversion.
Opera Mail stores its emails in the .MBS format. The Opera Mail to MBOX Converter helps you move and convert Opera mail to MBOX, giving you a reliable way to convert MBS to MBOX with all email content intact, so the messages can be opened in MBOX-based programs such as Thunderbird.
The tool also offers batch conversion: you can convert a whole bunch of .MBS mail messages to MBOX at once with a single click. Batch conversion requires the licensed version of the software.