I am trying to convert my .olm files files from from Ms outlook 2011 for mac to .mbox that is supported by Mac Mail. I want to separate my professional mails from the other ones. Firstly I tries the drag-n-drop procedure but only blank folders were treansferred. Secondly I tried the Imap procedure but I had limitations in securing folder hierarchy and had to attend each mail separately consuming a lot of time.

So is there any simple solutions to transfer 4000 mails stored in almost 12 folders from outlook 2011 to mac mail?

Thank you