FAQ : For email I'm running _________ and I want to migrate to Office365
Fill in the blank!
We provide native migration and coexistence options for Exchange Server and IMAP mail services, but if you are running other email systems and want a similar rich coexistance and migration experince, our partners have tools that can help get you there
Quest Migrator
https://www.quest.com/Office-365/
Binary Tree E2E
https://www.binarytree.com/Products/Migrate/E2E-Complete.aspx
MigrationWiz