Microsoft Exchange 2016 Standard Open License with Five CALs is a streamlined, secure way for you to manage your company's infrastructure. The Exchange 2016 email and calendaring software helps you manage data loss prevention and features enhanced auditing for better reporting and easier third-party application integration. This simplified version of Exchange has personalized email inboxes with intelligent features that include server components from the Exchange 2013 Mailbox and Client Access server roles, and includes flexibility to proxy traffic from the 2013 to the 2016 edition without the need to deploy enough front-end capacity to service the new Exchange 2016 servers. This software program is a perpetual open license with a two-year program term.
Today, CPU horsepower is significantly less expensive and is no longer a constraining factor. With that constraint lifted, the primary design goal for Exchange 2016 is for simplicity of scale, hardware utilization, and failure isolation. With Exchange 2016, we reduced the number of server roles to two: the Mailbox and Edge Transport server roles.
The Mailbox server in Exchange 2016 includes all of the server components from the Exchange 2013 Mailbox and Client Access server roles:
Mailbox services include all the traditional server components found in the Exchange 2013 Mailbox server role: the Client Access protocols, Transport service, Mailbox databases, and Unified Messaging. The Mailbox server handles all activity for the active mailboxes on that server.
Client Access services provide authentication, limited redirection, and proxy services. Client Access services don't do any data rendering and offer all the usual client access protocols: HTTP, POP and IMAP, and SMTP.
Along with the new Mailbox role, Exchange 2016 now allows you to proxy traffic from Exchange 2013 to Exchange 2016 in addition to Exchange 2016 to Exchange 2013. This new flexibility gives you more control in how you move to Exchange 2016 without having to worry about deploying enough front-end capacity to service new Exchange 2016 servers.
The Edge Transport role is typically deployed in your perimeter network, outside your internal Active Directory forest, and is designed to minimize the attack surface of your Exchange deployment. By handling all Internet-facing mail flow, it also adds additional layers of message protection and security against viruses and spam, and can apply transport rules to control message flow.
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