What are some alternatives?
When comparing MigrationWiz and Shoviv GroupWise to Office 365, you can also consider the following products
imapsync - Console-based utility for migrating IMAP mailboxes.
Micro Focus GroupWise - GroupWise collaboration software is a premier collaboration tool for large enterprises.
Yippie Move - The world's best email transfer tool
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.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
MailSteward - MailSteward : The Ultimate E-mail Manager for Mac OS X