akonadiimportwizard allows to import emails, settings, addressbook and
calendar data detected in your user account from the following mailers:

Trojit, Evolution 1.x - 3.x, OS X Mail, Opera, Sylpheed,
Thunderbird/Mozilla, The Bat!, Outlook Express, Balsa, Pegasus-Mail,
and Claws Mail.

Additionally you can use the manual import for KMail Archive,
mbox (Unix, Evolution), kmail Maildirs, Icedove, Lotus Notes,
Plain Text and Mailman Archives.