What are some alternatives?
When comparing SiteStacks and IMAP Upload, you can also consider the following products
Founderkit - Unbiased reviews of startup tools from experienced founders
imapsync - Console-based utility for migrating IMAP mailboxes.
Startup with Google - Tools to help with your new startup
Yippie Move - The world's best email transfer tool
Siftery - Share products your company uses and get personalized recommendations
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.