Access the server

If your business is using the latest version of Microsoft Exchange, you will need the Microsoft Exchange Standard User CAL Open Value to access the server. 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.

Advantages of Microsoft Exchange Standard

Latest security measures

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.

Data loss prevention
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Exchange has data loss prevention with more sensitive information types.

Easier integration
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Exchange has enhanced auditing for better reporting and easier integration with third-party apps.

Exchange architecture

With Exchange, we reduced the number of server roles to two:
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The Mailbox server

Edge Transport server roles

Today, CPU horsepower is significantly less expensive and is no longer a constraining factor. With that constraint lifted, the primary design goal for Exchange is for simplicity of scale, hardware utilization, failure isolation.

The Mailbox server in Exchange

The Mailbox server in Exchange includes all of the server components from the Exchange 2016 Mailbox and Client Access server roles:
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Exchange Mailbox

The Mailbox server handles all activity for the active mailboxes on that server. Mailbox services include all the traditional server components found in the Exchange Mailbox server role:

The Client Access protocols
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Transport service
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Mailbox databases
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Unified Messaging
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Client Access services

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.

Proxy traffic

Along with the new Mailbox role, Exchange now allows you to proxy traffic from Exchange 2016 to Exchange in addition to Exchange to Exchange 2016. This new flexibility gives you more control in how you move to Exchange without having to worry about deploying enough front-end capacity to service new Exchange servers.

The Edge Transport role

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.
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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.

Internet mail flow

All messages sent to the Internet from inside the organization are routed to Edge Transport servers after the messages are processed by the Transport service on the Exchange Mailbox server.

Antispam protection

In Exchange, antispam features provide services to block unsolicited commercial email (spam) at the network perimeter.

Edge Transport rules

Edge Transport rules are used to control the flow of messages sent to or received from the Internet. Edge Transport rules are configured on each Edge Transport server to help protect corporate network resources and data by applying an action to messages meeting specified conditions.

Address rewriting

Address rewriting presents a consistent email address appearance to external recipients. You configure address rewriting on Edge Transport servers to modify the SMTP addresses on inbound and outbound messages.

More About Microsoft Exchange Standard Open License User CAL

If your business is using the latest version of Microsoft Exchange, you will need the Microsoft Exchange Standard User CAL Open Value 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 value 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 has data loss prevention with more sensitive information types and enhanced auditing for better reporting and easier integration with third-party apps.