As part of the transition process from a PC to a Mac, I needed to move all my emails from the Outlook pst file to the folder/file format used in Mac Mail.
I came across an incredibly useful tool from little machines. The tool is called O2M (Outlook to Mail) and for only US$10, it’s a steal.
It also moves your contacts and calendar entries too so is very flexible.
I don’t know of a free or open source tool to do this. If someone knows of one, please contact me.
Note: I have to relationship whatsoever with Little Machines apart from being a happy (registered) user of their software.