Like previous Exchange versions, Exchange Server is available in two editions: Standard and Enterprise working only on the x64 platform. The same Exchange distribution is used, but the edition is determined by the entered product key. The functionality of both editions is identical except for the number of supported mailbox databases. Exchange Server Standard supports up to 5 mounted mailbox databases. When using DAG Database Availability Group both active and passive mailbox databases maintained by a server are counted. The recovery database does not take part in the calculation.
Which Edition of Exchange Server to Deploy? October 8, by Paul Cunningham 54 Comments If you're planning an Exchange Server deployment you will need to consider which edition of the product to deploy on your servers. For Exchange Server there are two editions of the server product itself, and there is only one difference between them which is the number of mounted databases per server. A mounted database can be an active mailbox database that is mounted for use by clients, or a passive mailbox database that is mounted in recovery for log replication and replay. While you can create more databases than the limits described above, you can only mount the maximum number specified above. The recovery database does not count towards this limit.
One of the most interesting conflicting licenses features applies to POP3 email. If the desired result is to allow only POP3 connections to the consumer email provides, set the following settings requires Standard CAL: In practical terms, if an organization wants to control what goes on a mobile device an Enterprise CAL would be needed to restrict consumer POP3 email from going on the device. Of note, if a connection exchange server 2016 licensing restricted and a user tries to sync it to their phone, they will receive an error like this:
Exchange 2016 Editions and Licensing