On your current Windows machine:
- Start on a Windows box with Outlook and .pst files (Personal Folders)
- Download Netscape 4.7X for Windows
- Launch Netscape, launch Netscape Mail
- Select File -> Import, choose Outlook 97/98 (regardless if you have Outlook 2000/XP), select Outlook profile (if you have one)
- Ensure all your .pst files and mboxes are selected (Personal Folders)
- Wait for the Import to finish, Quit Outlook and Netscape
- Launch Mail.app
- From the Finder, Connect to Server and connect to your Windows Machine
- Navigate to the Windows machine - C: -> Program Files -> Netscape -> Users -> YourUsername -> Mail -> Outlook Mail.sbd
- Copy the Personal Folders from the Windows machine to somewhere in your Home Directory (I chose my Documents folder)
- From Mail.app, choose File -> Import Mailboxes ... select standard mbox files
- Point towards the directory where you copied the Personal Folders from the Windows machine
- Ensure all the mailboxes are checked

