Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
imapsync - Console-based utility for migrating IMAP mailboxes.
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
Creativity 365 - Cross-device content creation suite
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.