What are some alternatives?
When comparing IMAP Upload and Piler, you can also consider the following products
Yippie Move - The world's best email transfer tool
MailStore - MailStore Home - A 100% free single-private-user desktop solution
imapsync - Console-based utility for migrating IMAP mailboxes.
Gmvault - Backup the emails in your Gmail account.
MigrationWiz - MigrationWiz provides on-demand mailbox migration services through a fully automated cloud-based...
Mail Backup X - Your one stop mail backup and archiving tool for Mac.