Info: Migrate security groups and delegates - The Office 365 email migration service cannot detect whether on-premises Active ...

Info: Migrate security groups and delegates - The Office 365 email migration service cannot detect whether on-premises Active Directory groups are security groups, so it cannot provision any migrated groups as security groups in Office 365. You must first create an empty mail-enabled security group in Office 365 before starting the staged migration. You should also understand that Exchange cutovers and staged migrations only move mailboxes and mail-enabled groups. If any other Active Directory object, such as a user that is not migrated to Office 365, is assigned as a manager or delegate to an object being migrated, they must be removed from the object prior to migration. Learn more at Security Groups and Delegates.