Apple Mail makes it easy to import your data from other e-mail clients.
1 Go to File... and click Import Mailboxes.
2 Choose the program from where you're importing data... then click Continue.
3 Browse for the location of your profile... then click Choose.
4 Select the items to import and click Continue.
5 Then click Done.
6 The new items can be found in the Import folder.
That's it! Now you know how to import data from other e-mail programs.