Migration from Exchange to Office365
Step by Step migrating from Exchange to Office365 with Exchange to Office365 Migrator which is the simplest way to get all your existing email into Office 365.
After doing so, Screen should show the Exchange Server Mailbox details
To view the following screen user must have administrator rights on the mailbox, to give mailbox administrator rights follow Step 3.
Select the users by checking the checkbox provided and then click the Next button