Exchange 2013 CU10 or later is required for coexistence with Exchange 2016 or later [E16E15CoexistenceMinVersionRequirement]

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The installation of Exchange Server 2016 or later can't continue because Setup found one or more Exchange 2013 servers that aren't running the minimum required version of Exchange 2013. Before you can install Exchange 2016 or later in your organization, all Exchange 2013 servers in the forest need to be running Exchange 2013 Cumulative Update 10 (CU10) or later. This requirement includes Exchange 2013 Edge Transport servers.

Important

After you upgrade your Exchange 2013 Edge Transport servers to Exchange 2013 CU10 or later, you need to re-create the Edge subscription between your Exchange organization and each Edge Transport server (to update the Edge Transport server's Exchange version in Active Directory). For more information about re-creating Edge subscriptions in Exchange 2013, see Manage Edge Subscriptions.