Sad because M2 was one the best mail clients ever. I here thunderbird is no longer being developed.
There was once a way to export your opera mail in Mbox format, Any ideas how to do that?

Open source please!

I need to move my mail to my nix box. But I can't find the export menu in the stand alone Mac mail client.
Version 1.0
Build 1040
Platform Mac OS X

PS when will you release a linux or unix client?