What are some alternatives?
When comparing MigrationWiz and OfflineIMAP, you can also consider the following products
imapsync - Console-based utility for migrating IMAP mailboxes.
Yippie Move - The world's best email transfer tool
iSync - iSync is a software application published by Apple Inc.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
IMAPSize - IMAPSize
audriga Email and Groupware migration - Easily migrate your email, contacts, calendar items and tasks to your new provider or server. No software installation is required.