Set permissions. The on-premises user account that you use to connect to your on-premises %BRAND_EXCHANGE_ONLINE_SHORT% organization ...

Set permissions. The on-premises user account that you use to connect to your on-premises %BRAND_EXCHANGE_ONLINE_SHORT% organization (also called the migration administrator) must have the necessary permissions to access the on-premises mailboxes that you want to migrate to %BRAND_OFFICE_365_SHORT%. This user account is used when you connect %BRAND_OFFICE_365_SHORT% to your email system later. To migrate the mailboxes, the admin must have one of the following permission sets: