Microsoft Exchange Server 2016 Standard CAL - LicenseMFR # 381-04398 Digital Download
Microsoft Exchange 2016 Standard User CAL - Open License
If your business is using the latest version of Microsoft Exchange, you will need the Microsoft Exchange 2016 Standard User CAL Open License to access the server. Client Access Licenses (CALs) serve as a safety measure to prevent unauthorized access to servers. These licenses are assigned to one person and each person on your team will need one to use Exchange. The open license nature of this user CAL means it is part of the Microsoft Volume Licensing program. The program is designed for businesses with between two and 250 that purchase licenses on an as-needed basis as opposed to buying in bulk. This version of exchange has the latest security measures in place to make communication a very safe endeavor, especially since more people are using tablets, laptops and cell phones to send emails as opposed to exclusively sending them while working on a PC. Exchange 2016 has data loss prevention with more sensitive information types and enhanced auditing for better reporting and easier integration with third-party apps.
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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