we recommend that you set up Office 365 mail services with an Exchange 2016 hybrid deployment. An Exchange hybrid deployment ...

, we recommend that you set up Office 365 mail services with an Exchange 2016 hybrid deployment. An Exchange hybrid deployment lets you have some mailboxes in your on-premises Exchange organization and some mailboxes in the Office 365 cloud. You manage all mailboxes — those on-premises and those in the cloud — from your existing on-premises Exchange organization. An Exchange hybrid deployment requires setting up directory synchronization between your on-premises Active Directory and Azure Active Directory, the directory service used by Office 365.