This is a question often asked by switchers (Windows PC -> Mac)
Windows – How to best move / import the previously received email from Outlook Express into Mail.app
emailmail.appwindows
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Best Answer
On the Windows
Download Eudora for Windows and install it if it's not already on your computer. Eudora can be used for free in sponsored or light mode.
If you see the New Account Wizard when you open Eudora, click Cancel. Go to the File menu and choose Import. It should automatically detect any Outlook or Outlook Express accounts.
Your Outlook or Outlook Express mailboxes should now appear in Eudora's mailbox list. Close Eudora. If prompted to save changes to the Address Book, click Yes.
Locate the newly created Eudora mailboxes and address book so they can be transferred to the Macintosh.
On the Mac
Download Eudora Mailbox Cleaner.
Eudora Mailbox Cleaner will display the results of the import. If the import was successful, the number of imported messages, recovered attachments, and imported nicknames should all be greater than zero.
Your messages should now appear in Mail.app in a folder called Import. Address book entries should appear in the OS X Address Book application.
NOTE: If you are unable to open the imported files, you may need to rebuild them. Select each folder, then go to Mailbox > Rebuild.