How to I move my PC Outlook folder structure (and history) plus archive pst email into mac mail?

Hi all. I have just bought a mac mini and used the migration assistant to move all my PC data across. This has worked well. With email, the assistant has correctly migrated all my email accounts and their inboxes with history. However, in Outlook on the PC I used to drag and drop emails from inboxes into a folder structure below. It seems that these have not copied across (ie I have no folder structure or the emails within). Added to this, I used to auto-archive on the PC so I have a .pst file with many older emails.

How can I bring in my old folder structure and history and how can I integrate the .pst data?

Thanks for any assistance