So far you have created the CSV file and migration endpoint for your migration batch. Now it's time to create the migration ...

So far you have created the CSV file and migration endpoint for your migration batch. Now it's time to create the migration batch and start mailbox migrations. When you run the migration batch, the initial mailbox synchronization migrates all email messages, contacts, and calendar items from the on-premises mailboxes to %BRAND_OFFICE_365_SHORT% mailboxes.