What are some alternatives?
When comparing IMAP Upload and Siftery, you can also consider the following products
imapsync - Console-based utility for migrating IMAP mailboxes.
Stackshare - StackShare is a comprehensive website that gives its users the chance to organize and share their technology stack with the rest of the community.
Yippie Move - The world's best email transfer tool
AlternativeTo - AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by recommending alternatives to apps you already know.
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.
SaaSHub - Promote the SaaS services you use, develop and love. Find cloud software that will help you grow your business.