Server licenses

With this license type, a license must be assigned for each instance of the server software that is being run. There are two server editions:
  • Standard: designed for the mailbox needs of small to midsize organizations. Also appropriate for non-mailbox roles in a larger Exchange deployment. This edition supports 1 to 5 mailbox databases.
  • Enterprise: designed for larger organizations that may require a greater number of mailbox databases. This edition supports 1 to 100 mailbox databases.

Client access licenses (CALs)

With this license type, a CAL is required for each user or device that accesses the server software. There are two types of CALs for Exchange, both of which work with either edition of the server:
  • Standard: designed to help users be more productive from virtually any platform, browser, or mobile device, with features in Exchange Server 2016 that help your users be productive no matter where they are—while helping protect your organization's data. To enable Standard CAL features for a user, the user must be licensed with the Standard CAL.
  • Enterprise: designed to allow organizations to reduce the cost and complexity of meeting compliance requirements with new integrated archiving functionality and information protection capabilities, while also helping you cut costs by replacing legacy voice mail systems with Unified Messaging. The Enterprise CAL is sold as an add-on to the Standard CAL—to enable Enterprise CAL features, the user must be licensed with one Standard CAL plus one Enterprise CAL.

The following table provides a detailed feature breakdown for each CAL.

Comparison of features of Standard CAL and Standard plus Enterprise CAL

Feature

Standard CAL

feature details, and more

Standard plus Enterprise CAL feature details, and moreTooltip with details about what is included in the two types of Exchange Enterprise CAL that are available

Feature

Email, calendar, contacts, and tasks

This feature is includedThis feature is included
Feature

Outlook on the Web (Internet Explorer, Firefox, Chrome, Safari, and Edge support)

This feature is includedThis feature is included
Feature

Apps for Outlook and Outlook on the web

This feature is includedThis feature is included
Feature
Site mailboxes Tooltip with information about Office 365 mobile apps
This feature is includedThis feature is included
Feature

Role-based access control (RBAC) capabilities

This feature is includedThis feature is included
Feature

Journaling

Per database Per user/distribution list
Feature

Journal decryption

This feature is not includedThis feature is included
Feature

Unified Messaging

This feature is not includedThis feature is included
Feature

Retention policies

Default and custom Default and custom
Feature

In-Place Archive Tooltip with information about specific Outlook version requirements for this feature

This feature is not includedThis feature is included
Feature

Multi-mailbox search

This feature is includedThis feature is included
Feature

In-Place Hold

This feature is not includedThis feature is included
Feature

Data Loss Prevention (DLP) Tooltip with information about specific Outlook version requirements for this feature

This feature is not includedThis feature is included
Feature

Information protection and control (IPC): transport protection rules, Outlook protection rules, Information Rights Management (IRM) search

This feature is not includedThis feature is included
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