What are some alternatives?
When comparing mnIMAPSync and Yippie Move, you can also consider the following products
imapsync - Console-based utility for migrating IMAP mailboxes.
OfflineIMAP - OfflineImap synchronizes email between an IMAP server and a MailDir or between two IMAP servers.
MigrationWiz - MigrationWiz provides on-demand mailbox migration services through a fully automated cloud-based...
MozBackup - Backup tool for Firefox and Thunderbird
iSync - iSync is a software application published by Apple Inc.
IMAP Upload - IMAP Upload is a tool for uploading a local mbox file to IMAP4 server.