Use this type of migration if you: have Exchange 2010, want to maintain both on-premises and online mailboxes (even if only ...

Use this type of migration if you: have Exchange 2010, want to maintain both on-premises and online mailboxes (even if only temporarily) for your organization, want to gradually migrate users and email to %BRAND_OFFICE_365%, and want to manage your %BRAND_OFFICE_365% users from on-premises. Requires setting up directory synchronization from on-premises to %BRAND_OFFICE_365%.