Your organization can migrate email to Office 365 from other systems. Your administrators can migrate mailboxes from an Exchange Server or migrate email from another email system. And your users can import their own email, contacts, and other mailbox information to an Office 365 mailbox created for them. Your organization also can work with a partner to migrate email.
Migrate mailboxes from Exchange Server
For migrations from an existing on-premises Exchange Server environment, an administrator can migrate all email, calendar, and contacts from user mailboxes to Office 365.
There are three types of email migrations that can be made from an Exchange Server: Continue reading → Ways to Migrate Multiple Email Accounts to Office 365