NOTE: If the cutover option is grayed out so that you can't select it, it usually means directory synchronization has been ...

NOTE: If the cutover option is grayed out so that you can't select it, it usually means directory synchronization has been activated for your organization. If DirSync is enabled, then a cutover migration is not an option. If you are using %BRAND_EXCHANGE_ONLINE_SHORT% 2003 or %BRAND_EXCHANGE_ONLINE_SHORT% 2007, a staged migration can be used instead. If you are using %BRAND_EXCHANGE_ONLINE_SHORT% 2010 or later, you can configure a minimal hybrid to migrate your users and email.