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What’s new when upgrading from Exchange 2016 to Exchange 2019? Security Windows Server Core support: Running Exchange on a Windows deployment with less surface area means less attack surface area and fewer components to service. Block external access to Exchange admin center (EAC) and the Exchange Management Shell: You can use Client Access Rules to only allow administration of Exchange from the internal network instead of using complex network and firewall rules. TLS 1.2 is the only version that’s enabled by default: Exchange Server 2019 includes important changes to improve the security of client and server connections. The default configuration for encryption will enable TLS 1.2 only and disable support for older algorithms (namely, DES, 3DES, RC2, RC4 and MD5). It will also configure elliptic curve key exchange algorithms with priority over non-elliptic curve algorithms. In Exchange Server 2016 and later, all cryptography settings are inherited from the configuration sp...