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Mail not being delivered between Office 365 and on-premise Exchange during cut-over migration.

ajdratch asked
Last Modified: 2019-12-20
I am doing an Office 365  cut-over migration from Exchange 2010.  I moved a couple mailboxes and now user's whose mailboxes are still on Exchange 2010 cannot send to mailboxes that have been moved to Office 365.

I successfully ran the Office 365 hybrid configuration.

In office 365 I added connectors from "Your organization's email server" to Office 365 and from Office 365 to "Your organization's email server."

What do I need to do to get mail flowing between mailboxes still in Exchange 2010 and mailboxes that have been moved to Office 365?
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